Marcianopolis or Marcianople ( Greek : Μαρκιανούπολις), also known as Parthenopolis was an ancient Greek, then Roman capital city and archbishopric in Moesia Inferior . It is located at the site of modern-day Devnya , Bulgaria . The ancient city has been partially excavated and is renowned for its museum collection of ancient mosaic floors from villas in the city.
193-583: Roman Emperor Trajan renamed the ancient city of Parthenopolis after the Second Dacian War , which ended in 106. The city was renamed after Trajan's sister, Ulpia Marciana . An important strategic centre, the city was part of Roman Thrace until 187–193, and then belonged to Moesia inferior. Marcianopolis's prosperity under the Severan Dynasty was ended by a Gothic raid in 248–249 and subsequent barbarian invasions from
386-608: A theocracy . According to George Ostrogorsky , "the absolute power of the Roman emperor was further increased with the advent of Christian ideas". This became more evident after the Muslim conquests of the 7th century, which gave Byzantine imperialism a new sense of purpose. The emperor was the subject of a series of rites and ceremonies, including a formal coronation performed by the Patriarch of Constantinople . The Byzantine state
579-519: A 50-year period that almost saw the end of the Roman Empire. The last vestiges of Republicanism were lost in the ensuing anarchy. In 238, the Senate attempted to regain power by proclaiming Pupienus and Balbinus as their own emperors (the first time since Nerva ). They managed to usurp power from Maximinus Thrax , but they were killed within two months. With the rise of the "soldier emperors",
772-620: A ceremony in the Temple of Jupiter . From Ravenna, Diocletian left for the Danube. There, possibly in Galerius's company, he took part in a campaign against the Carpi. He contracted a minor illness while on campaign, but his condition quickly worsened and he chose to travel in a litter . In the late summer, he left for Nicomedia. On 20 November 304, he appeared in public to dedicate the opening of
965-546: A court title bestowed to prominent figures of the government, and lost even more relevance after the creation of the title sebastokrator by Alexios I Komnenos . Despite this, its regular use by earlier emperors led to the name becoming synonym with "emperor" in certain regions. Several countries use Caesar as the origin of their word for "emperor", like Kaiser in Germany and Tsar in Bulgaria and Russia . After
1158-550: A cruel and oppressive tyrant. Julianus' forces were weak, and were handily dispersed when Carinus' armies moved from Britain to northern Italy. As the leader of the united East, Diocletian was clearly the greater threat. Over the winter of 284–85, Diocletian advanced west across the Balkans . In the spring, some time before the end of May, his armies met Carinus' across the river Margus ( Great Morava ) in Moesia . In modern accounts,
1351-544: A family name ( nomen ), styling himself as Imp. Caesar instead of Imp. Julius Caesar . However, the nomen was still inherited by women (such as Julia the Younger ) and appear in some inscriptions. After the death of Caligula , Augustus' great-grandson, his uncle Claudius was proclaimed emperor. He was not an official member of the Julia gens , but he was the grandson of Octavia , Augustus' sister, and thus still part of
1544-498: A lieutenant. According to Eutropius , Diocletian raised his fellow-officer Maximian to the office of Caesar , making him his heir and effective co-ruler. The concept of dual rulership was not new to the Roman Empire. Augustus , the first emperor, had nominally shared power with his colleagues, and a formal office of co-emperor (co- Augustus ) had existed from Marcus Aurelius onward. Most recently, Emperor Carus and his sons had ruled together, albeit unsuccessfully. Diocletian
1737-582: A line of succession. Galerius and Constantius would become Augusti after the departure of Diocletian and Maximian. Maximian's son Maxentius and Constantius's son Constantine would then become Caesars. In preparation for their future roles, Constantine and Maxentius were taken to Diocletian's court in Nicomedia. Diocletian spent the spring of 293 travelling with Galerius from Sirmium ( Sremska Mitrovica , Serbia ) to Byzantium ( Istanbul , Turkey ). Diocletian then returned to Sirmium, where he remained for
1930-473: A new caesar . Each pair ruled over a half of the Empire, which led to the creation of a Western and Eastern Roman Empire , a division that eventually became permanent. This division had already a precedent in the joint rule of Valerian / Gallienus and Carus / Carinus . Diocletian justified his rule not by military power, but by claiming divine right . He imitated Oriental divine kingship and encouraged
2123-608: A public ceremony at Antioch , the official version of events was clear: Galerius was responsible for the defeat; Diocletian was not. Diocletian publicly humiliated Galerius, forcing him to walk for a mile at the head of the Imperial caravan, still clad in the purple robes of the Emperor. Galerius was reinforced, probably in the spring of 298, by a new contingent collected from the empire's Danubian holdings. Narseh did not advance from Armenia and Mesopotamia, leaving Galerius to lead
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#17327659596612316-541: A regime in which the notion of legitimacy is as absent as that of the Augustan principate". Imperial propaganda was often used to legitimize or de-legitimize certain emperors. The Chronicon Paschale , for example, describes Licinius as having been killed like "those who had briefly been usurpers before him". In reality, Licinius was the legitimate emperor of the West (having been appointed by Galerius ), while Constantine
2509-412: A restorer, a figure of authority whose duty it was to return the empire to peace, to recreate stability and justice where barbarian hordes had destroyed it. He arrogated, regimented and centralized political authority on a massive scale. In his policies, he enforced an Imperial system of values on diverse and often unreceptive provincial audiences. In the Imperial propaganda from the period, recent history
2702-592: A revolt swept the region after Galerius's departure. The usurper Domitius Domitianus declared himself Augustus in July or August 297. Much of Egypt, including Alexandria , recognized his rule. Diocletian moved into Egypt to suppress him, first putting down rebels in the Thebaid in the autumn of 297, then moving on to besiege Alexandria. Domitianus died in December 297, by which time Diocletian had secured control of
2895-493: A statement that he was aged 68 at death (alongside other evidence). His parents were of low status; Eutropius records "that he is said by most writers to have been the son of a scribe, but by some to have been a freedman of a senator called Anulinus." The first forty years of his life are mostly obscure. Diocletian was considered an Illyricianus ( Illyrian ) who had been schooled and promoted by Aurelian . The 12th-century Byzantine chronicler Joannes Zonaras states that he
3088-404: A statue of Jupiter, his patron deity, Diocletian addressed the crowd. With tears in his eyes, he told them of his weakness, his need for rest, and his will to resign. He declared that he needed to pass the duty of empire on to someone stronger. He thus became the first (and arguably only) Roman emperor to voluntarily abdicate his title. Most in the crowd believed that Constantine and Maxentius,
3281-426: A time of civil war, savage despotism, and imperial collapse. In those inscriptions that bear their names, Diocletian, the "founder of eternal peace", and his companions are referred to as "restorers of the whole world", men who succeeded in "defeating the nations of the barbarians, and confirming the tranquility of their world". The theme of restoration was conjoined to an emphasis on the uniqueness and accomplishments of
3474-703: A victory in the ongoing conflict with Persia , and Diocletian was hailed as the "founder of eternal peace". The events might have represented a formal end to Carus's eastern campaign, which probably ended without an acknowledged peace. At the conclusion of discussions with the Persians, Diocletian re-organized the Mesopotamian frontier and fortified the city of Circesium (Buseire, Syria) on the Euphrates . Maximian's campaigns were not proceeding as smoothly. The Bagaudae had been easily suppressed, but Carausius ,
3667-632: A way military power and dynastic claims could not. After his acclamation, Maximian was dispatched to fight the rebel Bagaudae , insurgent peasants of Gaul. Diocletian returned to the East, progressing slowly. By 2 November, he had only reached Civitas Iovia (Botivo, near Ptuj , Slovenia ). In the Balkans during the autumn of 285, he encountered a tribe of Sarmatians who demanded assistance. The Sarmatians requested that Diocletian either help them recover their lost lands or grant them pasturage rights within
3860-561: Is known as the Dominate , derived from the title dominus ("lord") adopted by Diocletian . During his rule, the emperor became an absolute ruler and the regime became even more monarchical. The emperors adopted the diadem crown as their supreme symbol of power, abandoning the subtleties of the early Empire. Beginning in the late 2nd century, the Empire began to suffer a series of political and economic crises, partially because it had overexpanded so much. The Pax Romana ("Roman peace")
4053-598: Is never used. The imperial titles are treated as inseparable of the person, which is reflected in the name Imperator Caesar Vespasianus Augustus . This Lex sometimes related to the Lex regia ("royal law") mentioned in the Corpus Juris Civilis of Eastern emperor Justinian I (r. 527–565), who cites the early 3rd-century writer Ulpian . This was probably a later construct, as its very name, which derives from rex ("king"), would have been utterly rejected in
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#17327659596614246-633: Is often said to have ended with the tyrannical reign of Commodus. His murder was followed by the accession of Septimius Severus , the victor of the Year of the Five Emperors . It was during his reign that the role of the army grew even more, and the emperors' power increasingly depended on it. The murder of his last relative, Severus Alexander , led to the Crisis of the Third Century (235–285),
4439-520: Is often said to have followed a " Caesaropapist " model, where the emperor played the role of ruler and head of the Church, but there was often a clear distinction between political and secular power. The line of Eastern emperors continued uninterrupted until the sack of Constantinople and the establishment of the Latin Empire in 1204. This led to the creation of three lines of emperors in exile:
4632-519: Is still often regarded as a usurper, similarly to Magnus Maximus , who was briefly recognized by Theodosius I . Western emperors such as Magnentius , Eugenius and Magnus Maximus are sometimes called usurpers, but Romulus Augustulus is traditionally regarded as the last Western emperor, despite never receiving the recognition of the Eastern emperor Zeno . The period after the Principate
4825-402: Is unclear. At the conclusion of the peace, Tiridates regained both his throne and the entirety of his ancestral claim. Rome secured a wide zone of cultural influence, which led to a wide diffusion of Syriac Christianity from a center at Nisibis in later decades, and the eventual Christianization of Armenia. To strengthen the defence of the east Diocletian had a fortified road constructed at
5018-521: The fasces in place of Carinus and Numerian. Bassus was a member of a senatorial family from Campania , a former consul and proconsul of Africa, chosen by Probus for signal distinction. He was skilled in areas of government where Diocletian presumably had no experience. Diocletian's elevation of Bassus symbolized his rejection of Carinus' government in Rome, his refusal to accept second-tier status to any other emperor, and his willingness to continue
5211-399: The pomerium ; and use discretionary power whenever necessary. The text further states that he is "not bound by laws", and that any previous act was retroactively considered legitimate. There is no mention of imperium nor tribunicia potestas , although these powers were probably given in the earlier clauses. There is also no mention of any "imperial office", and the title of "emperor"
5404-532: The Alamanni . Diocletian invaded Germania through Raetia while Maximian progressed from Mainz. Each burned crops and food supplies as he went, destroying the Germans' means of sustenance. The two men added territory to the empire and allowed Maximian to continue preparations against Carausius without further disturbance. On his return to the East, Diocletian managed what was probably another rapid campaign against
5597-699: The Battle of the Margus . Diocletian's reign stabilized the empire and ended the Crisis of the Third Century . He appointed fellow officer Maximian as Augustus , co-emperor, in 286. Diocletian reigned in the Eastern Empire , and Maximian reigned in the Western Empire . Diocletian delegated further on 1 March 293, appointing Galerius and Constantius as junior colleagues (each with the title Caesar ), under himself and Maximian respectively. Under
5790-635: The Constantinian dynasty , emperors followed Imperator Caesar with Flavius , which also began as a family name but was later incorporated into the emperor's titles, thus becoming Imperator Caesar Flavius . The last use of the formula, rendered as Autokrator Kaisar Flabios... Augoustos (Αὐτοκράτωρ καῖσαρ Φλάβιος αὐγουστος) in Greek, is in the Basilika of Leo VI the Wise (r. 886–912). Originally
5983-528: The Papal States . Pepin's son, Charlemagne , was crowned Imperator Romanorum (the first time Imperator was used as an actual regnal title) by Pope Leo III in Christmas AD 800, thus ending the recognition of the Eastern emperor. Western rulers also began referring to the Empire as the "Greek Empire", regarding themselves as the true successors of Rome. The inhabitants of the Eastern half of
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6176-504: The Quadi and Marcomanni immediately after the Battle of the Margus. He eventually made his way to northern Italy and made an imperial government, but it is not known whether he visited Rome at this time. There is a contemporary issue of coins suggestive of an imperial adventus (arrival) for the city, but some modern historians state that Diocletian avoided the city, to demonstrate that
6369-477: The Roman Republic and was given to victorious commanders by their soldiers. They held imperium , that is, military authority. The Senate could then award the extraordinary honor of a triumph ; the commander then retained the title until the end of his magistracy . In Roman tradition, the first triumph was that of Romulus , the founder of Rome, but the first attested use of imperator was in 189 BC, on
6562-489: The Sarmatians . Diocletian replaced the prefect of Rome with his consular colleague Bassus. Most officials who had served under Carinus, however, retained their offices under Diocletian. In an act of clementia denoted by the epitomator of Aurelius Victor as unusual, Diocletian did not kill or depose Carinus's traitorous praetorian prefect and consul Aristobulus , but confirmed him in both roles. He later gave him
6755-524: The Tetrarchy the powers of the caesar increased considerably, but following the accession of Constantine I it once more remained as a title for heirs with no significant power attached to it. The title slowly lost importance in the following decades, as emperors started to promote their sons directly to augustus . In the East, the title finally lost its imperial character in 705, when Justinian II awarded it to Tervel of Bulgaria . After this it became
6948-403: The Tetrarchy , from a Greek term meaning "rulership by four". The Tetrarchs were more or less sovereign in their own lands, and they travelled with their own imperial courts, administrators, secretaries, and armies. They were joined by blood and marriage; Diocletian and Maximian now styled themselves as brothers, and formally adopted Galerius and Constantius as sons. These relationships implied
7141-461: The Tetrarchy , or "rule of four", each tetrarch would rule over a quarter-division of the empire. Diocletian secured the empire's borders and purged it of all threats to his power. He defeated the Sarmatians and Carpi during several campaigns between 285 and 299, the Alamanni in 288, and usurpers in Egypt between 297 and 298. Galerius, aided by Diocletian, campaigned successfully against Persia ,
7334-513: The de facto sole ruler of Rome in 48 BC, when he defeated his last opposition at the Battle of Pharsalus . His killers proclaimed themselves as the liberatores ("liberators") and the restorers of the Republic, but their rule was cut short by Caesar's supporters, who almost immediately established a new dictatorship. In his will, Caesar appointed his grandnephew Octavian as his heir and adopted son. He inherited his property and lineage,
7527-422: The emperors of Nicaea , the emperors of Trebizond , and the short-lived emperors of Thessalonica . The Nicean rulers have been traditionally regarded as the "legitimate" emperors of this period, as they recovered Constantinople and restored the Empire in 1261. The Empire of Trebizond continued to exist for another 200 years, but from 1282 onwards its rulers used the modified title of "Emperor and Autocrat of all
7720-555: The fall of the Western Roman Empire , as it was used by rulers such as Theodoric the Great . Diocletian Diocletian ( / ˌ d aɪ . ə ˈ k l iː ʃ ən / DYE -ə- KLEE -shən ; Latin : Gaius Aurelius Valerius Diocletianus ; Ancient Greek : Διοκλητιανός , romanized : Diokletianós ; 242/245 – 311/312), nicknamed Jovius , was Roman emperor from 284 until his abdication in 305. He
7913-408: The proconsuls of the few senatorial provinces and allies such as Agrippa . The governors appointed to the imperial provinces only answered to the emperor himself, who could maintain or replace them at will. The tribunician power ( tribunicia potestas ), first assumed by Augustus in 23 BC, gave him authority over the tribune of the plebs without having to actually hold the office – a tribune
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8106-577: The second encounter , Roman forces seized Narseh's camp, his treasury, his harem, and his wife. Galerius continued down the Tigris, and took the Persian capital Ctesiphon before returning to Roman territory along the Euphrates. Narseh sent an ambassador to Galerius to plead for the return of his wives and children in the course of the war, but Galerius dismissed him. Serious peace negotiations began in
8299-519: The " Year of the Five Emperors ", but modern scholarship now identifies Clodius Albinus and Pescennius Niger as usurpers because they were not recognized by the Roman Senate . Recognition by the Senate is often used to determine the legitimacy of an emperor, but this criterion is not always followed. Maxentius is sometimes called an usurper because he did not have the recognition of Tetrarchs , but he held Rome for several years, and thus had
8492-649: The "Aurelius Valerius" family. The relationship between Diocletian and Maximian was quickly couched in religious terms. Around 287 Diocletian assumed the title Iovius (Jovius), and Maximian assumed the title Herculius (Hercules). The titles were probably meant to convey certain characteristics of their associated leaders. Diocletian, in Jovian style, would take on the dominating roles of planning and commanding; Maximian, in Herculian mode, would act as Jupiter's heroic subordinate. For all their religious connotations,
8685-594: The "shadow emperor". In 476, the Heruli Odoacer overthrew the child-emperor Romulus Augustulus , made himself king of Italy and shipped the imperial regalia to the Emperor Zeno in Constantinople. Historians mark this date as the date of the fall of the Western Roman Empire , although by this time there was no longer any "Empire" left, as its territory had reduced to Italy. Julius Nepos , who
8878-573: The 5th century, there was scarcely a single decade without succession conflicts and civil war. During this period, very few emperors died of natural causes. Such problems persisted in the later Eastern Empire, where emperors had to often appoint co-emperors to secure the throne. Despite often working as a hereditary monarchy, there was no law or single principle of succession. Individuals who claimed imperial power "illegally" are referred to as " usurpers " in modern scholarship. Ancient historians refer to these rival emperors as " tyrants ". In reality, there
9071-570: The 7th century, they called the ruins of the ancient city Devina . Remains of the Roman city include the amphitheatre , some streets and many exquisite mosaics of the House of Antiope, a Roman villa of the late 3rd or early 4th century AD which are exhibited in the Museum of Mosaics , some in situ . 43°13′30″N 27°35′6″E / 43.22500°N 27.58500°E / 43.22500; 27.58500 Roman Emperor The Roman emperor
9264-532: The 9th century. Its last known use was on 866–867 coins of Michael III and his co-emperor Basil I , who are addressed as imperator and rex respectively. In the West, imperator was transformed into a monarchical title by Charlemagne , becoming the official Latin title of the Holy Roman Empire . Originally the cognomen (third name) of the dictator Gaius Julius Caesar , which was then inherited by Augustus and his relatives. Augustus used it as
9457-706: The East, the Iberians , and the Perateia ", accepting the Niceans as the sole Roman emperors. However, the Byzantine Empire had been reduced mostly to Constantinople, and the rise of other powers such as Serbia and Bulgaria forced the Byzantines to recognize their rulers as basileus . Despite this, emperors continued to view themselves as the rulers of an "universal empire". During the last decades of
9650-553: The Eastern provinces soon thereafter. He returned with haste to the West, reaching Emesa by 10 May 290, and Sirmium on the Danube by 1 July 290. Diocletian met Maximian in Milan either in late December 290 or January 291. The meeting was undertaken with a sense of solemn pageantry. The emperors spent most of their time in public appearances. It has been surmised that the ceremonies were arranged to demonstrate Diocletian's continuing support for his faltering colleague. A deputation from
9843-535: The Egyptian countryside. Alexandria, whose defense was organized under Domitianus's former corrector Aurelius Achilleus , held out probably until March 298. Later in 298, the triumphal column now known as Pompey's Pillar was erected in Alexandria to honor Diocletian. Bureaucratic affairs were completed during Diocletian's stay: a census took place, and Alexandria, in punishment for its rebellion, lost
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#173276595966110036-432: The Empire always saw the emperor as an open monarch. Starting with Heraclius in 629, Roman emperors styled themselves " basileus ", the traditional title for Greek monarchs used since the times of Alexander the Great . The title was used since the early days of the Empire and became the common imperial title by the 3rd century, but did not appear in official documents until the 7th century. Michael I Rangabe (r. 811–813)
10229-440: The Empire used it regularly. It began to used in official context starting with Septimius Severus , and was first officially adopted in coinage by Aurelian . In the East, imperator was translated as autokrator ("self-ruler"), a title that continued to be used until the end of the Empire. This is the modern Greek word for "emperor" ( υτοκράτορας ). There are still some instances of imperator in official documents as late as
10422-494: The Empire, power was once again shared between multiple emperors and colleagues, each ruling from their own capital, notably during the long reign of John V . Constantinople finally fell to the Ottoman Turks in 1453; its last emperor, Constantine XI Palaiologos , dying in battle. The last vestiges of the empire, Morea and Trebizond , fell in 1461. The title imperator – from imperare , "to command" – dates back to
10615-516: The Empire, while later functioning as de facto separate entities, were always considered and seen, legally and politically, as separate administrative divisions of a single, insoluble state by the Romans of the time. In the West , the office of emperor soon degenerated into being little more than a puppet of Germanic generals such as Aetius and Ricimer ; the last emperors of the West being known as
10808-603: The English translation of the Latin imperator , then Julius Caesar had been an emperor, like several Roman generals before him. Instead, by the end of the Caesar's civil wars , it became clear that there was certainly no consensus to return to the old-style monarchy , but that the period when several officials would fight one another had come to an end. Julius Caesar, and then Augustus after him, accumulated offices and titles of
11001-470: The Imperial household. This post earned him the honor of a consulship in 283. Carus's death, amid a successful war with Persia and in mysterious circumstances – he was believed to have been struck by lightning or killed by Persian soldiers – left his sons Numerian and Carinus as the new Augusti . Carinus quickly made his way to Rome from his post in Gaul and arrived there by January 284, becoming
11194-584: The Lower Danube extolled restored tranquility to the region. The defense came at a heavy cost but was a significant achievement in an area difficult to defend. Galerius, meanwhile, was engaged during 291–293 in disputes in Upper Egypt , where he suppressed a regional uprising. He returned to Syria in 295 to fight the revanchist Persian empire. Diocletian's attempts to bring the Egyptian tax system in line with Imperial standards stirred discontent, and
11387-515: The Republic, Diocletian established at the top of this new structure the Tetrarchy ("rule of four") in an attempt to provide for smoother succession and greater continuity of government. Under the Tetrarchy, Diocletian set in place a system of two emperors ( augusti ) and two subordinates that also served as heirs ( caesares ). When an emperor retired (as Diocletian and Maximian did in 305) or died, his caesar would succeed him and in turn appoint
11580-508: The Roman Senate met with the emperors, renewing its infrequent contact with the Imperial office. The choice of Milan over Rome further snubbed the capital's pride. But then it was already a long-established practice that Rome itself was only a ceremonial capital, as the actual seat of the Imperial administration was determined by the needs of defense. Long before Diocletian, Gallienus (r. 253–68) had chosen Milan for his headquarters. If
11773-421: The Roman state as an autocrat , but he failed to create a stable system to maintain himself in power. His rise to power was the result of a long and gradual decline in which the Republic fell under the influence of powerful generals such as Marius and Sulla . At the end of the Republic no new, and certainly no single, title indicated the individual who held supreme power. Insofar as emperor could be seen as
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#173276595966111966-443: The Roman world among them. Lepidus was sidelined in 36 BC, and relations between Octavian and Antony soon deteriorated. In September 31 BC, Octavian's victory at Actium put an end to any effective opposition and confirmed his supremacy over Rome. In January 27 BC, Octavian and the Senate concluded the so-called " First settlement ". Until then Octavian had been ruling the state with his powers as triumvir , even though
12159-479: The Senate awarded him the appellation of augustus ("elevated"). The honorific itself held no legal meaning, but it denoted that Octavian (henceforth Augustus ) now approached divinity, and its adoption by his successors made it the de facto main title of the emperor. He also received the civic crown alongside several other insignias in his honor. Augustus now held supreme and indisputable power, and even though he still received subsequent grants of powers, such as
12352-434: The Senate, or both. The first emperors reigned alone; later emperors would sometimes rule with co-emperors to secure the succession or to divide the administration of the empire between them. The office of emperor was thought to be distinct from that of a rex ('king'). Augustus, the first emperor, resolutely refused recognition as a monarch. For the first three hundred years of Roman emperors, efforts were made to portray
12545-516: The Triumvirate itself disappeared years earlier. He announced that he would return the power to the Senate and People of Rome , but this was only an act. The Senate confirmed Octavian as princeps , the " first among equals ", and gave him control over almost all Roman provinces for a tenure of ten years. This limitation was only superficial, as he could renew his powers indefinitely. In addition,
12738-505: The West acknowledged the Eastern emperors until the accession of Empress Irene in 797. After this, the papacy created a rival lineage of Roman emperors in western Europe, the Holy Roman Emperors , which ruled the Holy Roman Empire for most of the period between 800 and 1806. These emperors were never recognized in Constantinople and their coronations resulted in the medieval problem of two emperors . The last Eastern emperor
12931-569: The West remaining after the death of Julius Nepos in 480. Instead the Eastern emperor Zeno proclaimed himself as the sole emperor of a theoretically undivided Roman Empire (although in practice he had no authority in the West). The subsequent Eastern emperors ruling from Constantinople styled themselves as " Basileus of the Romans" ( Ancient Greek : βασιλεύς Ῥωμαίων , Basileus Romaíon ) but are often referred to in modern scholarship as Byzantine emperors . The papacy and Germanic kingdoms of
13124-423: The West. The Eastern Greek-speaking half of the Empire had always regarded the emperors as open monarchs ( basileis ), and called them as such. The weakest point of the Augustan institution was its lack of a clear succession system. Formally announcing a successor would have revealed Augustus as a monarch, so he and subsequent emperors opted to adopt their best candidates as their sons and heirs. Primogeniture
13317-555: The ability to mint independently. Diocletian's reforms in the region, combined with those of Septimius Severus , brought Egyptian administrative practices much closer to Roman standards. Diocletian travelled south along the Nile the following summer, where he visited Oxyrhynchus and Elephantine . In Nubia, he made peace with the Nobatae and Blemmyes tribes. Under the terms of the peace treaty Rome's borders moved north to Philae and
13510-652: The adoptive son of the long-deceased Marcus Aurelius , hence why he named Caracalla after him. Later Eastern imperial dynasties, such as the Doukai and Palaiologoi , claimed descent from Constantine the Great . What turns a "usurper" into a "legitimate" emperor is typically that they managed to gain the recognition of a more senior, legitimate, emperor, or that they managed to defeat a more senior, legitimate emperor and seize power. Modern historiography has not yet defined clear legitimacy criteria for emperors, resulting in some emperors being included or excluded from different lists. The year 193 has traditionally been called
13703-543: The apocalypse. Diocletian entered the city of Rome in the early winter of 303. On 20 November, he celebrated, with Maximian, the twentieth anniversary of his reign ( vicennalia ), the tenth anniversary of the Tetrarchy ( decennalia ), and a triumph for the war with Persia. Diocletian soon grew impatient with the city, as the Romans acted towards him with what Edward Gibbon , following Lactantius , calls "licentious familiarity". The Roman people did not give enough deference to his supreme authority; they expected him to act
13896-558: The archaeological evidence, is that Carausius had held some important military post in Britain, already had a firm basis of power in Britain and Northern Gaul, and profited from the lack of legitimacy of the central government. Carausius strove to have his legitimacy as a junior emperor acknowledged by Diocletian: in his coinage, he extolled the "concord" between him and the central power. One bronze piece from 290 read PAX AVGGG, "the Peace of
14089-601: The army and the bureaucracy, so the principle of automatic inheritance was not adopted, which often led to several claimants to the throne . Despite this, elements of the republican institutional framework (Senate, consuls, and magistrates) were preserved even after the end of the Western Empire. Constantine the Great , the first Christian emperor, moved the capital from Rome to Constantinople , formerly known as Byzantium , in 330 AD. Roman emperors had always held high religious offices; under Constantine there arose
14282-474: The authority based on prestige. The honorific was awarded as both a name and a title to Octavian in 27 BC and was inherited by all subsequent emperors, who placed it after their personal names. The only emperor to not immediately assume it was Vitellius , although he did use it after his recognition by the Senate. Later emperors ruled alongside one or several junior augusti who held de jure (but not de facto ) equal constitutional power. Despite its use as
14475-507: The autumn of 302. He ordered that the deacon Romanus of Caesarea have his tongue removed for defying the order of the courts and interrupting official sacrifices. Romanus was then sent to prison, where he was executed on 17 November 303. Diocletian left the city for Nicomedia in the winter, accompanied by Galerius. According to Lactantius, Diocletian and Galerius argued over imperial policy towards Christians while wintering at Nicomedia in 302. Diocletian believed that forbidding Christians from
14668-639: The blade, and high-status Manicheans must be sent to work in the quarries of Proconnesus ( Marmara Island , Turkey) or the mines of Phaeno in southern Palestine . All Manichean property was to be seized and deposited in the imperial treasury . Diocletian found much to be offended by in Manichean religion: its novelty, its alien origins, its perceived corruption of Roman morals, and its inherent opposition to long-standing religious traditions. His reasons for opposing Manichaeanism were also applied to his next target, Christianity. Diocletian returned to Antioch in
14861-454: The bureaucracy and military would be sufficient to appease the gods, but Galerius pushed for extermination. The two men sought the advice of the oracle of Apollo at Didyma . The oracle responded that the impious on Earth hindered Apollo's ability to provide advice. Rhetorically Eusebius records the Oracle as saying "The just on Earth..." These impious, Diocletian was informed by members of
15054-422: The circus beside his palace. He collapsed soon after the ceremonies. Over the winter of 304–05 he kept within his palace at all times. Rumors spread through the city that Diocletian's death was being kept secret until Galerius could assume power. On 13 December, it was falsely announced that Diocletian had killed himself. The city was sent into mourning from which it recovered after public declarations that Diocletian
15247-476: The city and Senate of Rome began to lose importance. Maximinus and Carus , for example, did not even set foot on the city. Carus' successors Carinus and Numerian , the last of the Crisis emperors, did not bother to assume the tribunicia potestas either. After reuniting the Roman Empire in 285, Diocletian began a series of reforms to restore stability. Reaching back to the oldest traditions of job-sharing in
15440-440: The city and its Senate were no longer politically relevant to the affairs of the empire. Diocletian dated his reign from his elevation by the army, not his ratification by the Senate, following the practice established by Carus, who had declared the Senate's ratification a useless formality. However, Diocletian offered proof of his deference towards the Senate by retaining Aristobulus as ordinary consul and colleague for 285 (one of
15633-400: The continuance of the Republic. The title had already been used by Pompey and Julius Caesar , among others. It was a purely honorific title with no attached duties or powers, hence why it was never used in official titulature. The title was the most preferred by Augustus as its use implies only "primacy" (is in the " first among equals "), as opposed to dominus , which implies dominance. It
15826-488: The court, could only refer to the Christians of the empire. At the behest of his court, Diocletian acceded to demands for universal persecution. On 23 February 303, Diocletian ordered that the newly built church at Nicomedia be razed. He demanded that its scriptures be burned, and seized its precious stores for the treasury. The next day, Diocletian's first "Edict against the Christians" was published. The edict ordered
16019-549: The creation of a worship cult . Augustus became pontifex maximus (the chief priest of the College of Pontiffs ) in 12 BC, after the death of the former triumvir Lepidus . Emperors from the reign of Gratian (r. 375–383) onward used the style pontifex inclytus ("honorable pontiff"). The title of pontifex maximus was eventually adopted by the bishops of Rome during the Renaissance . The last known emperors to use
16212-399: The destruction of Christian scriptures and places of worship across the empire, and prohibited Christians from assembling for worship. Before the end of February, a fire destroyed part of the Imperial palace. Galerius convinced Diocletian that the culprits were Christians, conspirators who had plotted with the eunuchs of the palace. An investigation was commissioned, but no responsible party
16405-617: The emperor derived from an extraordinary concentration of individual powers and offices that were extant in the Republic and developed under Augustus and later rulers, rather than from a new political office. Under the Republic, these powers would have been split between several people, who would each exercise them with the assistance of a colleague and for a specific period of time. Augustus held them all at once by himself, and with no time limits; even those that nominally had time limits were automatically renewed whenever they lapsed. The Republican offices endured and emperors were regularly elected to
16598-453: The emperors as leaders of the Republic, fearing any association with the kings who ruled Rome prior to the Republic. From Diocletian , whose reformed tetrarchy divided the position into one emperor in the West and one in the East , emperors ruled in an openly monarchic style. Although succession was generally hereditary, it was only hereditary if there was a suitable candidate acceptable to
16791-485: The emperors were not "gods" in the tradition of the Imperial cult – although they may have been hailed as such in Imperial panegyrics . Instead, they were seen as the gods' representatives, effecting their will on earth. The shift from military acclamation to divine sanctification took the power to appoint emperors away from the army. Religious legitimization elevated Diocletian and Maximian above potential rivals in
16984-526: The empire to remain essentially intact for another 150 years despite being near the brink of collapse in Diocletian's youth. Weakened by illness, Diocletian left the imperial office on 1 May 305, becoming the first Roman emperor to abdicate the position voluntarily. He lived out his retirement in his palace on the Dalmatian coast , tending to his vegetable gardens. His palace eventually became the core of
17177-450: The empire's frontiers than the traditional capital at Rome. Building on third-century trends towards absolutism , he styled himself an autocrat, elevating himself above the empire's masses with imposing forms of court ceremonies and architecture. Bureaucratic and military growth, constant campaigning, and construction projects increased the state's expenditures and necessitated a comprehensive tax reform. From at least 297 on, imperial taxation
17370-412: The empire's last, largest, and bloodiest official persecution of Christianity , failed to eliminate Christianity in the empire. After 324, Christianity became the empire's preferred religion under Constantine . Despite these failures and challenges, Diocletian's reforms fundamentally changed the structure of the Roman imperial government and helped stabilize the empire economically and militarily, enabling
17563-551: The empire's traditional enemy, and in 299, he sacked their capital, Ctesiphon . Diocletian led the subsequent negotiations and achieved a lasting and favorable peace. Diocletian separated and enlarged the empire's civil and military services and reorganized the empire's provincial divisions, establishing the largest and most bureaucratic government in the history of the empire. He established new administrative centers in Nicomedia , Mediolanum , Sirmium , and Trevorum , closer to
17756-643: The empire. Diocletian refused and fought a battle with them, but was unable to secure a complete victory. The nomadic pressures of the European Plain remained and could not be solved by a single war; soon the Sarmatians would have to be fought again. Diocletian wintered in Nicomedia . There may have been a revolt in the eastern provinces at this time, as he brought settlers from Asia to populate emptied farmlands in Thrace . He visited Syria Palaestina
17949-413: The end of the Empire. In the West, the title was also used by Charlemagne and the subsequent Holy Roman Emperors as part of the formula Imperator Augustus . Both Eastern and Western rulers also used the style semper augustus ("forever augustus"). The word princeps , meaning "first", was a republican term used to denote the leading member of the Senate, and it was used by the early emperors to emphasize
18142-400: The entire crowd turned to face Constantine. It was not to be: Severus II and Maximinus II were declared caesars. Maximinus appeared and took Diocletian's robes. On the same day, Severus received his robes from Maximian in Milan. Constantius succeeded Maximian as Augustus of the West, but Constantine and Maxentius were entirely ignored in the transition of power. This did not bode well for
18335-441: The failure of the Tetrarchy. This practice had first been applied by Septimius Severus , who proclaimed his 10-year-old son Caracalla as augustus . He was followed by Macrinus , who did the same with his 9-year-old son Diadumenian , and several other emperors during the Crisis. This became even more common from the 4th century onwards. Gratian was proclaimed emperor at the age of 8, and his co-ruler and successor Valentinian II
18528-500: The family. Following the suicide of Nero, the last descendant of Caesar, the new emperor Galba adopted the name of Servius Galba Caesar Augustus , thus making it part of the imperial title. Five days before his murder he adopted Piso Licinianus as his son and heir, renaming him as Servius Sulpicius Galba Caesar . After this Caesar came to denote the heir apparent, who would add the name to his own as heir and retain it upon accession as augustus . The only emperor not to assume it
18721-480: The few instances during the Late Empire in which an emperor admitted a privatus as his colleague) and by creating senior senators Vettius Aquilinus and Junius Maximus ordinary consuls for the following year – for Maximus, it was his second consulship. If Diocletian did enter Rome shortly after his accession, he did not stay long; he is attested back in the Balkans by 2 November 285, on campaign against
18914-412: The first emperor, whereas Julius Caesar is considered the last dictator of the Roman Republic , a view that is shared by the Roman writers Plutarch , Tacitus , and Cassius Dio . Conversely, the majority of Roman writers, including Pliny the Younger , Suetonius and Appian , as well as most of the ordinary people of the Empire, thought of Julius Caesar as the first emperor. Caesar did indeed rule
19107-462: The first. Galerius left the city for Rome, declaring Nicomedia unsafe. Diocletian would soon follow. Although further persecutory edicts followed, compelling the arrest of the Christian clergy and universal acts of sacrifice, they were ultimately unsuccessful; most Christians escaped punishment, and pagans too were generally unsympathetic to the persecution. The martyrs ' sufferings strengthened
19300-568: The five satrapies between the Tigris and Armenia: Ingilene , Sophanene ( Sophene ), Arzanene ( Aghdznik ), Corduene (Carduene), and Zabdicene (near modern Hakkâri , Turkey). These regions included the passage of the Tigris through the Anti-Taurus range; the Bitlis pass, the quickest southerly route into Persian Armenia; and access to the Tur Abdin plateau. A stretch of land containing
19493-413: The following spring, His stay in the East saw diplomatic success in the conflict with Persia: in 287, Bahram II granted him precious gifts, declared open friendship with the Empire, and invited Diocletian to visit him. Roman sources insist that the act was entirely voluntary. Around the same time, perhaps in 287, Persia relinquished claims on Armenia and recognized Roman authority over territory to
19686-581: The following winter and spring. He campaigned successfully against the Sarmatians in 294, probably in the autumn. The Sarmatians' defeat kept them from the Danube provinces for a long time. Meanwhile, Diocletian built forts north of the Danube, part of a new defensive line called the Ripa Samartica , at Aquincum ( Budapest , Hungary ), Bononia ( Vidin , Bulgaria), Ulcisia Vetera, Castra Florentium, Intercisa ( Dunaújváros , Hungary), and Onagrinum ( Begeč , Serbia). In 295 and 296 Diocletian campaigned in
19879-568: The frequency of their incursions. No details survive for these events. Some of the princes of these states were Persian client kings, a disturbing fact for the Romans in light of increasing tensions with the Sassanids. In the West, Maximian lost the fleet built in 288 and 289, probably in the early spring of 290. The panegyrist who refers to the loss suggests that its cause was a storm, but this might have been an attempt to conceal an embarrassing military defeat. Diocletian broke off his tour of
20072-499: The future security of the tetrarchic system. Diocletian retired to his homeland, Dalmatia . He moved into the expansive Diocletian's Palace , a heavily fortified compound located by the small town of Spalatum on the shores of the Adriatic Sea , and near the large provincial administrative center of Salona . The palace is preserved in great part to this day and forms the historic core of Split , modern-day Croatia , where it
20265-421: The future. The haruspices were unable to read the entrails of the sacrificed animals and blamed Christians in the Imperial household. The emperors ordered all members of the court to perform a sacrifice to purify the palace. The emperors sent letters to the military command, demanding the entire army perform the required sacrifices or face discharge. Diocletian was conservative in matters of religion, faithful to
20458-417: The granting of tribunicia potestas in 23 BC, these were only ratifications of the powers he already possessed. Most modern historians use 27 BC as the start date of the Roman Empire. This is mostly a symbolic date, as the Republic had essentially disappeared many years earlier. Ancient writers often ignore the legal implications of Augustus' reforms and simply write that he "ruled" Rome following
20651-452: The hands of Maxentius. He ordered Maximian, who had attempted to return to power after his retirement, to step down permanently. At Carnuntum people begged Diocletian to return to the throne, to resolve the conflicts that had arisen through Constantine's rise to power and Maxentius's usurpation. Diocletian's reply: "If you could show the cabbage that I planted with my own hands to your emperor, he definitely wouldn't dare suggest that I replace
20844-414: The highest imperial title, it was generally not used to indicate the office of Emperor itself, as ordinary people and writers had become accustomed to Imperator . In the East the title was initially translated as Sebastos , but the form Augoustos eventually became more common. Emperors after Heraclius styled themselves as Basileus , but Augoustos still remained in use in a lesser form up until
21037-445: The highest importance in the Republic, making the power attached to those offices permanent, and preventing anyone with similar aspirations from accumulating or maintaining power for themselves. Julius Caesar had been pontifex maximus since 64 BC; held the offices of consul and dictator five times since 59 BC, and was appointed dictator in perpetuity in 44 BC, shortly before his assassination . He had also become
21230-472: The household guard, had already defected to Diocletian in the early spring. When the Battle of the Margus began, Carinus' prefect Aristobulus also defected. In the course of the battle, Carinus was killed by his own men. Following Diocletian's victory, both the western and the eastern armies acclaimed him as Emperor. Diocletian exacted an oath of allegiance from the defeated army and departed for Italy. Diocletian may have become involved in battles against
21423-499: The lands delivered to Tiridates in the peace of 287. He moved south into Roman Mesopotamia in 297, where he inflicted a severe defeat on Galerius in the region between Carrhae ( Harran , Turkey) and Callinicum ( Raqqa , Syria), suggested by the historian Fergus Millar to have been somewhere on the Balikh River . Diocletian may or may not have been present at the battle, but he quickly divested himself of all responsibility. In
21616-465: The later strategic strongholds of Amida ( Diyarbakır , Turkey) and Bezabde came under firm Roman military occupation. With these territories, Rome would have an advance station north of Ctesiphon, and would be able to slow any future advance of Persian forces through the region. Many cities east of the Tigris came under Roman control, including Tigranokert , Saird , Martyropolis , Balalesa , Moxos , Daudia , and Arzan – though under what status
21809-471: The legitimate Emperor in the West. Numerian lingered in the East. The Roman withdrawal from Persia was orderly and unopposed. The Sassanid king Bahram II could not field an army against them as he was still struggling to establish his authority. By March 284, Numerian had only reached Emesa (Homs) in Syria ; by November, only Asia Minor. In Emesa he was apparently still alive and in good health: he issued
22002-447: The light of the sun and swore an oath disclaiming responsibility for Numerian's death. He asserted that Aper had killed Numerian and concealed it. In full view of the army, Diocles drew his sword and killed Aper. Soon after Aper's death, Diocles changed his name to the more Latinate "Diocletianus" – in full, Gaius Valerius Diocletianus. After his accession, Diocletian and Lucius Caesonius Bassus were named as consuls and assumed
22195-542: The long-standing collaboration between the empire's senatorial and military aristocracies. It also tied his success to that of the Senate, whose support he would need in his advance on Rome. Diocletian was not the only challenger to Carinus' rule; the usurper Julianus , Carinus' corrector Venetiae , took control of northern Italy and Pannonia after Diocletian's accession. Julianus minted coins from Siscia ( Sisak , Croatia) declaring himself emperor and promising freedom. This aided Diocletian in his portrayal of Carinus as
22388-467: The loyalty of most of his allies, and – again through a formal process of senatorial consent – an increasing number of the titles and offices that had accrued to Caesar. In August 43 BC, following the death of both consuls of the year , Octavian marched to Rome and forced the Senate to elect him consul. He then formed the Second Triumvirate alongside Mark Antony and Lepidus , dividing
22581-421: The main title of the emperor. According to Suetonius , it was "not merely a new title but a more honorable one, inasmuch as sacred places too, and those in which anything is consecrated by augural rites are called "august" ( augusta ), from the increase ( auctus ) in dignity". It was also connected to the religious practice of augury , which was itself linked to Rome's founding by Romulus , and to auctoritas ,
22774-567: The man he had put in charge of operations against Saxon and Frankish pirates on the Saxon Shore , had, according to literary sources, begun keeping the goods seized from the pirates for himself. Maximian issued a death warrant for his larcenous subordinate. Carausius fled the Continent, proclaimed himself emperor, and agitated Britain and northwestern Gaul into open revolt against Maximian and Diocletian. Far more probable, according to
22967-472: The marginalization of the former heartland of Italy to the empire had a profound cultural impact on the empire and its emperor, which adopted a more Hellenistic character. The Eastern emperors continued to be recognized in the Western kingdoms until the accession of Irene (r. 797–802), the first empress regnant . The Italian heartland was recovered during the reign of Justinian I (r. 527–565), but this
23160-576: The modern-day city of Split in Croatia. Diocletian was born in Dalmatia , probably at or near the town of Salona (modern Solin , Croatia ), to which he retired later in life. His original name was Diocles (in full, Gaius Valerius Diocles), possibly derived from Dioclea, the name of both his mother and her supposed place of birth . Diocletian's official birthday was 22 December, and his year of birth has been estimated at between 242 and 245 based on
23353-411: The most prominent of them: the consulship and censorship . This early period of the Empire is known as the " Principate ", derived from the title princeps used by the early emperors. The most important bases of the emperor's power were his supreme power of command ( imperium maius ) and tribunician power ( tribunicia potestas ) as personal qualities, separate from his public office. Originally,
23546-510: The murder of Caesar, or that he "ruled alone" after the death of Mark Antony. Most Romans thus simply saw the "emperor" as the individual that ruled the state, with no specific title or office attached to him. Augustus actively prepared his adopted son Tiberius to be his successor and pleaded his case to the Senate for inheritance on merit. After Augustus' death in AD ;14, the Senate confirmed Tiberius as princeps and proclaimed him as
23739-447: The new augustus . Tiberius had already received imperium maius and tribunicia potestas in AD 4, becoming legally equal to Augustus but still subordinate to him in practice. The "imperial office" was thus not truly defined until the accession of Caligula , when all of Tiberius' powers were automatically transferred to him as a single, abstract position that was symbolized by his sacred title of augustus . The legal authority of
23932-491: The news in Nicomedia ( İzmit ) in November. Numerian's generals and tribunes called a council for the succession, and chose Diocles as Emperor, in spite of Aper's attempts to garner support. On 20 November 284, the army of the east gathered on a hill 5 kilometres (3.1 mi) outside Nicomedia. The army unanimously saluted Diocles as their new Augustus , and he accepted the purple imperial vestments. He raised his sword to
24125-454: The north. The Romans repulsed another Gothic attack to this town in 267 (or 268), during the reign of Gallienus . Under Emperor Diocletian Marcianopolis became the centre of the province Moesia Secunda of the Diocese of Thrace, and was rebuilt thoroughly in the late 3rd and early 4th century. It grew in importance at the expense of neighbouring Odessos (Varna) in the 4th century. The city
24318-426: The offensive in 298 with an attack on northern Mesopotamia via Armenia. It is unclear if Diocletian was present to assist the campaign; he might have returned to Egypt or Syria. Narseh retreated to Armenia to fight Galerius's force, putting himself at a disadvantage; the rugged Armenian terrain was favorable to Roman infantry, but not to Sassanid cavalry. In two battles, Galerius won major victories over Narseh. During
24511-402: The office of caesar. The same day, in either Philippopolis ( Plovdiv , Bulgaria ) or Sirmium, Diocletian did the same for Galerius , husband to Diocletian's daughter Valeria, and perhaps Diocletian's praetorian prefect. Constantius was assigned Gaul and Britain. Galerius was initially assigned Syria, Palestine, Egypt, and responsibility for the eastern borderlands. This arrangement is called
24704-403: The only adult sons of reigning emperors, who had long been preparing to succeed their fathers, would be granted the title of Caesar . Constantine had travelled through Palestine at the right hand of Diocletian, and was present at the palace in Nicomedia in 303 and 305. It is likely that Maxentius received the same treatment. In Lactantius's account, when Diocletian announced that he was to resign,
24897-555: The only extant rescript in his name there, but after he left the city, his staff, including the prefect (Numerian's father-in-law and the dominant influence in his entourage) Aper , reported that he suffered from an inflammation of the eyes. He traveled in a closed coach from then on. When the army reached Bithynia , some of the soldiers smelled an odor emanating from the coach. They opened its curtains and found Numerian dead. Both Eutropius and Aurelius Victor describe Numerian's death as an assassination. Aper officially broke
25090-555: The panegyric detailing the ceremony implied that the true center of the empire was not Rome, but where the emperor sat ("...the capital of the empire appeared to be there, where the two emperors met"), it simply echoed what had already been stated by the historian Herodian in the early third century: "Rome is where the emperor is". During the meeting, decisions on matters of politics and war were probably made in secret. The Augusti would not meet again until 303. Some time after his return, and before 293, Diocletian transferred command of
25283-631: The part of an aristocratic ruler, not a monarchic one. On 20 December 303, Diocletian cut short his stay in Rome and left for the north. He did not even perform the ceremonies investing him with his ninth consulate; he did them in Ravenna on 1 January 304 instead. There are suggestions in the Panegyrici Latini and Lactantius's account that Diocletian arranged plans for his and Maximian's future retirement of power in Rome. Maximian, according to these accounts, swore to uphold Diocletian's plan in
25476-606: The peace and happiness of this place with the storms of a never-satisfied greed." Diocletian lived for four more years, spending his days in his palace gardens. He saw his tetrarchic system fail, torn apart by the civil wars of his successors . He heard of Maximian's third claim to the throne, his forced suicide, and his damnatio memoriae . In his own palace, statues and portraits of his former companion emperor were torn down and destroyed. After an illness, Diocletian died on 3 December 311, with some proposing that he took his own life in despair. Diocletian saw his work as that of
25669-410: The powers of command where divided in consular imperium for Rome and proconsular imperium for the provinces . This division became obsolete in 19 BC, when Augustus was given consular imperium – despite leaving the consulship in 23 BC – and thus control over all troops. This overwhelming power was referred to as imperium maius to indicate its superiority to other holders of imperium , such as
25862-419: The proconsulate of Africa and the post of urban prefect for 295. The other figures who retained their offices might have also betrayed Carinus. The assassinations of Aurelian and Probus demonstrated that sole rulership was dangerous to the stability of the empire. Conflict boiled in every province, from Gaul to Syria, Egypt to the lower Danube. It was too much for one person to control, and Diocletian needed
26055-448: The protectors of the Church. The territorial divisions of the Tetrarchy were maintained, and for most of the following century the Empire was ruled by two senior emperors, one in the West (with Milan and later Ravenna as capital) and another in the East (with Constantinople as capital). This division became permanent on the death of Theodosius I in 395, when he was succeeded by his sons Honorius and Arcadius . The two halves of
26248-440: The recognition of the Senate. Other "usurpers" controlled, if briefly, the city of Rome, such as Nepotianus and Priscus Attalus . In the East, the possession of Constantinople was the essential element of legitimacy, yet some figures such as Procopius are treated as usurpers. Rival emperors who later gained recognition are not always considered legitimate either; Vetranio had the formal recognition by Constantius II yet he
26441-448: The region again, and won a victory over the Carpi in the summer of 296. Later during both 299 and 302, as Diocletian was residing in the East, it was Galerius's turn to campaign victoriously on the Danube. By the end of his reign, Diocletian had secured the entire length of the Danube, provided it with forts, bridgeheads, highways, and walled towns, and sent fifteen or more legions to patrol the region; an inscription at Sexaginta Prista on
26634-400: The resolve of their fellow Christians. Constantius and Maximian did not apply the later edicts, and left the Christians of the West unharmed. Galerius rescinded the edict in 311, announcing that the persecution had failed to bring Christians back to traditional religion. The temporary apostasy of some Christians, and the surrendering of scriptures, during the persecution played a major role in
26827-415: The resurgent Sarmatians. No details survive, but surviving inscriptions indicate that Diocletian took the title Sarmaticus Maximus after 289. In the East, Diocletian engaged in diplomacy with desert tribes in the regions between Rome and Persia. He might have been attempting to persuade them to ally themselves with Rome, thus reviving the old, Rome-friendly, Palmyrene sphere of influence , or to reduce
27020-406: The reverence of the emperor, making anything related to him sacer (sacred). He declared himself Jovius , the son of Jupiter , and his partner Maximian was declared Herculius , son of Hercules . This divine claim was maintained after the rise of Christianity, as emperors regarded themselves as the chosen rulers of God. The emperor no longer needed the Senate to ratify his powers, so he became
27213-520: The rogue commander, so in 287 he campaigned against tribes beyond the Rhine instead. As Carausius was allied to the Franks, Maximian's campaigns could be seen as an effort to deny him a basis of support on the mainland. The following spring, as Maximian prepared a fleet for an expedition against Carausius, Diocletian returned from the East to meet Maximian. The two emperors agreed on a joint campaign against
27406-420: The same to Maximian at Sirmium. Scholars doubt Lactantius' account, since he had a strong bias against Galerius and probably attempted to villainize him. On 1 May 305, Diocletian called an assembly of his generals, traditional companion troops, and representatives from distant legions. They met at the same hill, 5 kilometres (3.1 mi) out of Nicomedia, where Diocletian had been proclaimed emperor. In front of
27599-488: The site has been located between the Mons Aureus (Seone, west of Smederevo ) and Viminacium , near modern Belgrade , Serbia. Despite having a stronger, more powerful army, Carinus held the weaker position. His rule was unpopular, and it was later alleged that he had mistreated the Senate and seduced his officers' wives. It is possible that Flavius Constantius , the governor of Dalmatia and Diocletian's associate in
27792-436: The sole source of law. These new laws were no longer shared publicly and were often given directly to the praetorian prefects – originally the emperor's bodyguard, but now the head of the new praetorian prefectures – or with private officials. The emperor's personal court and administration traveled alongside him, which further made the Senate's role redundant. Consuls continued to be appointed each year, but by this point, it
27985-535: The southern border, where the empire bordered the Arabs, in the year 300. This road would remain in use for centuries but proved ineffective in defending the border as conventional armies could not operate in the region. At the conclusion of the Peace of Nisibis , Diocletian and Galerius returned to Antioch . At some time in 299, the emperors took part in a ceremony of sacrifice and divination in an attempt to predict
28178-496: The specifically Christian idea that the emperor was God's chosen ruler on earth, a special protector and leader of the Christian Church, a position later termed Caesaropapism . In practice, an emperor's authority on Church matters was frequently subject to challenge. The Western Roman Empire collapsed in the late 5th century after multiple invasions by Germanic barbarian tribes, with no recognised claimant to Emperor of
28371-485: The spring of 299. The magister memoriae (secretary) of Diocletian and Galerius, Sicorius Probus, was sent to Narseh to present terms. The conditions of the resulting Peace of Nisibis were heavy: Armenia returned to Roman domination, with the fort of Ziatha as its border; Caucasian Iberia would pay allegiance to Rome under a Roman appointee; Nisibis, now under Roman rule, would become the sole conduit for trade between Persia and Rome; and Rome would exercise control over
28564-466: The subsequent Donatist controversy. Within twenty-five years of the persecution's inauguration, the Christian emperor Constantine would rule the empire alone. He would reverse the consequences of the edicts, and return all confiscated property to Christians. Under Constantine's rule, Christianity would become the empire's preferred religion. Diocletian was demonized by his Christian successors: Lactantius intimated that Diocletian's ascendancy heralded
28757-593: The three Augusti"; on the other side, it showed Carausius together with Diocletian and Maximian, with the caption CARAVSIVS ET FRATRES SVI, "Carausius & his brothers". However, Diocletian could not allow a breakaway regional usurper following in Postumus 's footprints to enter, of his own accord, the imperial college. Spurred by the crisis, on 1 April 286, Maximian took up the title of Augustus (emperor). Unusually, Diocletian could not have been present to witness it. It has even been suggested that Maximian usurped
28950-467: The title and was only later recognized by Diocletian in hopes of avoiding civil war. This suggestion is unpopular, as it is clear that Diocletian meant for Maximian to act with a certain amount of independence. It may be posited that Diocletian felt the need to bind Maximian closer to him, by making him his empowered associate, to avoid the possibility of him striking some sort of deal with Carausius. Maximian realized that he could not immediately suppress
29143-418: The title continued to be used for a time, with emperors registering the number of times they were hailed imperator . The title became the main appellation of the ruler by the time of Vespasian . After the Tetrarchy , emperors began to be addressed as dominus noster ("our Lord"), although imperator continued to be used. The appellation of dominus was known and rejected by Augustus, but ordinary men of
29336-533: The title of caesar . The Senate still exercised some power during this period, as evidenced by his decision to declare Nero a "public enemy", and did influence in the succession of emperors. Following the murder of Domitian in AD 96, the Senate declared Nerva , one of their own, as the new emperor. His "dynasty", the Antonine , continued the adoptive system until the reign of Marcus Aurelius (r. 161–180). Marcus
29529-473: The title of consul was Constans II , who was also the last Eastern emperor to visit Rome. It's possible that later emperors also used it as an honorary title, as the office of consul was not abolished until 892, during the reign of Leo VI . During the Dominate it became increasingly common for emperors to raise their children directly to augustus (emperor) instead of caesar (heir), probably because of
29722-418: The title was Junius Blaesus in AD 22, after which it became a title reserved solely for the sovereign. Augustus used Imperator instead of his first name ( praenomen ), becoming Imperator Caesar instead of Caesar Imperator . From this the title slowly became a synonym of the office, hence the word "emperor". Tiberius , Caligula and Claudius avoided using the title, but it is recorded that Caligula
29915-489: The title were Valentinian III and Marcian , in the 5th century. The only surviving document to directly refer to the emperor's power is the Lex de imperio Vespasiani , written shortly after Vespasian 's formal accession in December 69. The text, of which only the second part survives, states that Vespasian is allowed to: make treaties; hold sessions and propose motions to the Senate; hold extraordinary sessions with legislative power; endorse candidates in elections; expand
30108-415: The traditional Roman pantheon and understanding of demands for religious purification, but Eusebius , Lactantius and Constantine state that it was Galerius , not Diocletian, who was the prime supporter of the purge. Galerius, even more devoted and passionate than Diocletian, saw political advantage in the persecution. He was willing to break with a government policy of inaction on the issue. Antioch
30301-409: The tribunes, such as sacrosanctity , since 36 BC. With this powers, he could veto any act or proposal of any magistrate, propose laws and convoke the Senate. His sacrosanctity also made him untouchable, and any offence against him could be treated as a crime of treason. The tribunician power was arguably the most stable and important of the emperor's powers. Despite being a perpetual title, it
30494-514: The triumph of Aemilius Paulus . It was a title held with great pride: Pompey was hailed imperator more than once, as was Sulla and Julius Caesar . However, as noted by Cassius Dio , the meaning of the title changed under the new monarchy, and came to denote "the possession of the supreme power". Both Dio and Suetonius refer to Caesar as the first one to assume imperator as a proper name (a praenomen imperatoris ), but this seems to be an anachronism . The last ordinary general to be awarded
30687-768: The two tribes received an annual gold stipend. Diocletian left Africa quickly after the treaty, moving from Upper Egypt in September 298 to Syria in February 299. He met with Galerius in Mesopotamia. In 294, Narseh , a son of Shapur who had been passed over for the Sassanid succession, came to power in Persia. In early 294, Narseh sent Diocletian the customary package of gifts between the empires, and Diocletian responded with an exchange of ambassadors. Within Persia, Narseh
30880-507: The vague terms of "second" or "little emperor". Despite having a successful reign himself, Diocletian's tetrarchic system collapsed as soon as he retired in 305. Constantine I , the son of tetrarch Constantius I , reunited the empire in 324 and imposed the principle of hereditary succession which Diocletian intended to avoid. Constantine was also the first emperor to convert to Christianity , and emperors after him, especially after its officialization under Theodosius I , saw themselves as
31073-404: The war against Carausius from Maximian to Flavius Constantius , who concluded it successfully in 296. Constantius was a former governor of Dalmatia and a man of military experience stretching back to Aurelian 's campaigns against Zenobia (272–73). He was Maximian's praetorian prefect in Gaul, and the husband to Maximian's daughter, Theodora . On 1 March 293 at Milan, Maximian gave Constantius
31266-576: The west and south of the Tigris. The western portion of Armenia was incorporated into the empire and made a province. Tiridates III , the Arsacid claimant to the Armenian throne and a Roman client, had been disinherited and forced to take refuge in the empire after the Persian conquest of 252–53. In 287, he returned to lay claim to the eastern half of his ancestral domain and encountered no opposition. Bahram II's gifts were widely recognized as symbolic of
31459-478: Was imperator , originally a military honorific, and caesar , originally a cognomen . Early emperors also used the title princeps ('first one') alongside other Republican titles, notably consul and pontifex maximus . The legitimacy of an emperor's rule depended on his control of the Roman army and recognition by the Senate ; an emperor would normally be proclaimed by his troops, or by
31652-600: Was Dux Moesiae , a commander of forces on the lower Danube . The often-unreliable Historia Augusta states that he served in Gaul , but this is not corroborated by other sources and is ignored by modern historians. The first time Diocletian's whereabouts are accurately established was in 282 when the Emperor Carus made him commander of the Protectores domestici , the elite cavalry force directly attached to
31845-674: Was Constantine XI Palaiologos , who died during the Fall of Constantinople to the Ottoman Empire in 1453. After conquering the city, Ottoman sultans adopted the title " Caesar of the Romans" ( kayser-i Rûm ). A Byzantine group of claimant emperors existed in the Empire of Trebizond until its conquest by the Ottomans in 1461, although they had used a modified title since 1282. Modern historians conventionally regard Augustus as
32038-415: Was Vitellius , who adopted the name Germanicus instead. Most emperors used it as their nomen – with Imperator as their praenomen – until the reign of Antoninus Pius , when it permanently became part of the formula Imperator Caesar [full name] Augustus . In the 3rd century, caesars also received the honorific of nobilissimus ("most noble"), which later evolved into a separate title. During
32231-535: Was Diocletian's primary residence from 299 to 302, while Galerius swapped places with his Augustus on the Middle and Lower Danube. Diocletian visited Egypt once, over the winter of 301–2, and issued a grain dole in Alexandria. Following some public disputes with Manicheans , Diocletian ordered that the leading followers of Mani be burnt alive along with their scriptures. In a 31 March 302 rescript from Alexandria, he declared that low-status Manicheans must be executed by
32424-508: Was also used to distinguish a junior co-emperor ( basileus ) from his senior colleague ( basileus autokrator ). By the times of the Palaiologos , there were two distinct ceremonies for the accession of an emperor: first an acclamation as basileus , and later a coronation as autokrator (which also included being raised on a shield). These rites could happen years apart. The Eastern Empire became not only an absolute monarchy but also
32617-512: Was always renewed each year, which often coincided with the beginning of a new regnal year (although " regnal years " were not officially adopted until Justinian I ). The office of censor was not fully absorbed into the imperial office until the reign of Domitian , who declared himself "perpetual censor" ( censor perpetuus ) in AD 85. Before this, the title had been only used by Claudius (47), Vespasian and Titus (both in 73). The emperor also had power over religious affairs, which led to
32810-618: Was an important episcopal centre and a basilica from the period was excavated in the 20th century. During Emperor Valens ' conflict with the Goths (366–369), Marcianopolis was a temporary capital of the empire and the largest city of Thrace according to a source from the period. In 447, it was destroyed by the Huns under Attila , immediately after the bloody battle of the Utus river . Emperor Justinian I restored and fortified it. In 587, it
33003-446: Was an office often occupied by the emperor himself, who now had complete control over the bureaucratic apparatus. Diocletian did preserve some Republican traditions, such as the tribunicia potestas . The last known emperor to have used it was Anastasius I , at the start of the 6th century. Anastasius was also the last attested emperor to use the traditional titles of proconsul and pater patriae . The last attested emperor to use
33196-525: Was born Diocles to a family of low status in the Roman province of Dalmatia . Diocles rose through the ranks of the military early in his career, eventually becoming a cavalry commander for the army of Emperor Carus . After the deaths of Carus and his son Numerian on a campaign in Persia , Diocles was proclaimed emperor by the troops, taking the name Diocletianus. The title was also claimed by Carus's surviving son, Carinus , but Diocletian defeated him in
33389-401: Was by definition a plebeian , whereas Augustus, although born into a plebeian family, had become a patrician when he was adopted into the gens Julia . By adopting the role of a tribune, Augustus was presenting himself as the representative of the common man and the protector of democracy. As always, this was not a sudden grant of power; Augustus had been receiving several powers related to
33582-654: Was designated a World Heritage Site by UNESCO in 1979. Maximian retired to villas in Campania or Lucania . Their homes were distant from political life, but Diocletian and Maximian were close enough to remain in regular contact with each other. Galerius assumed the consular fasces in 308 with Diocletian as his colleague. In the autumn of 308, Galerius again conferred with Diocletian at Carnuntum ( Petronell-Carnuntum , Austria ). Diocletian and Maximian were both present on 11 November 308, to see Galerius appoint Licinius to be Augustus in place of Severus, who had died at
33775-483: Was destroying every trace of his immediate predecessors from public monuments. He sought to identify himself with the warlike kings Ardashir I (r. 226–241) and Shapur I (r. 241–272), who had defeated and imprisoned Emperor Valerian (r. 253–260) following his failed invasion of the Sasanian Empire . Narseh declared war on Rome in 295 or 296. He appears to have first invaded western Armenia, where he seized
33968-446: Was found. Executions followed anyway, and the palace eunuchs Dorotheus and Gorgonius were executed. One individual, Peter Cubicularius , was stripped, raised high, and scourged. Salt and vinegar were poured in his wounds, and he was slowly boiled over an open flame. The executions continued until at least 24 April 303, when six individuals, including the bishop Anthimus , were decapitated . A second fire occurred sixteen days after
34161-419: Was hailed imperator by the Senate on his accession, indicating that it was already considered an integral part of the dignity. It was not until the late reign of Nero , in AD 66, that imperator became once more part of the emperor's nomenclature. Virtually all emperors after him used the praenomen imperatoris , with only a few variations under his successors Galba and Vitellius . The original meaning of
34354-619: Was in a less comfortable position than most of his predecessors, as he had a daughter, Valeria, but no sons. His co-ruler had to be from outside his family, raising the question of trust. Some historians state that Diocletian adopted Maximian as his filius Augusti , his "Augustan son", upon his appointment to the throne, following the precedent of some previous Emperors. This argument has not been universally accepted. Diocletian and Maximian added each other's nomina (their family name , "Valerius" and "Aurelius", respectively) to their own, thus creating an artificial family link and becoming part of
34547-426: Was no distinction between emperors and usurpers, as many emperors started as rebels and were retroactively recognized as legitimate. The Lex de imperio Vespasiani explicitly states that all of Vespasian's actions are considered legal even if they happened before his recognition by the Senate. Ultimately, "legitimacy was a post factum phenomenon." Theodor Mommsen famously argued that "here has probably never been
34740-618: Was not relevant in the early Empire, although emperors still attempted to maintain a familiar connection between them; Tiberius , for example, married Julia the Elder , making him Augustus ' son-in-law. Vespasian , who took power after the collapse of the Julio-Claudian dynasty and the tumultuous Year of the Four Emperors , was the first emperor to openly declare his sons, Titus and Domitian , as his sole heirs, giving them
34933-407: Was overthrown and expelled to Dalmatia in favor of Romulus, continued to claim the title until his murder in 480. The Eastern court recognized this claim and Odoacer minted coins in his name, although he never managed to exercise real power. The death of Nepos left Zeno as the sole emperor of a (technically) reunited Roman Empire. The Roman Empire survived in the East for another 1000 years, but
35126-469: Was perverted and minimized in the service of the theme of the tetrarchs as "restorers". Aurelian's achievements were ignored, the revolt of Carausius was backdated to the reign of Gallienus, and it was implied that the tetrarchs engineered Aurelian's defeat of the Palmyrenes ; the period between Gallienus and Diocletian was effectively erased. The history of the empire before the tetrarchy was portrayed as
35319-412: Was proclaimed emperor at the age of 4. Many child emperors such as Philip II or Diadumenian never succeeded their fathers. These co-emperors all had the same honors as their senior counterpart, but they did not share the actual government, hence why junior co-emperors are usually not counted as real emperors by modern or ancient historians. There was no title to denote the "junior" emperor; writers used
35512-413: Was replaced with dominus ("lord"); the use of princeps and dominus broadly symbolizes the differences in the empire's government, giving rise to the era designations Principate and Dominate . The title is still found in some later sources, however. The poet Claudian , for example, describes Honorius as having been raised from " caesar " to " princeps " (instead of augustus ). The title survived
35705-565: Was reverted by the end of the century. Rome technically remained under imperial control , but was completely surrounded by the Lombards . Africa was lost to the Arabs in the early 7th century, and Rome eventually fell to the Lombards in 751, during the reign of Constantine V . The Frankish king Pepin the Short defeated them and received the favour of Pope Stephen II , who became the head of
35898-569: Was sacked by the Avars but at once retaken by the Byzantines. The Byzantine army was quartered there in 596 before crossing the Danube to assault the Avars. Despite the regular barbarian attacks, Marcianopolis remained an important centre until an Avar raid finally destroyed it in 614–615, although it still continued to be mentioned on maps until much later. As the Slavs settled in the Balkans in
36091-564: Was standardized, made more equitable, and levied at generally higher rates. Not all of Diocletian's plans were successful: the Edict on Maximum Prices (301), his attempt to curb inflation via price controls , was counterproductive and quickly ignored. Although effective while he ruled, Diocletian's tetrarchic system collapsed after his abdication under the competing dynastic claims of Maxentius and Constantine, sons of Maximian and Constantius respectively. The Diocletianic Persecution (303–312),
36284-516: Was still alive. When Diocletian reappeared in public on 1 March 305, he was emaciated and barely recognizable. Galerius arrived in the city later in March. According to Lactantius , he came armed with plans to reconstitute the Tetrarchy, force Diocletian to step down, and fill the Imperial office with men compliant to his will. Through coercion and threats, he eventually convinced Diocletian to comply with his plan. Lactantius also claims that he had done
36477-486: Was the first emperor to actually use the title of "Roman emperor" (βασιλεύς Ῥωμαίων, Basileus Romaíon ). This was a response to the new line of emperors created by Charlemagne – although he was recognized as basileus of the Franks . By the 9th century the full imperial title became " basileus and autokrator of the Romans", usually translated as "Emperor and Autocrat of the Romans". The title autokrator
36670-409: Was the first emperor to rule alongside other emperors, first with his adoptive brother Lucius Verus , who succeeded jointly with him, and later with his son Commodus , who was proclaimed co- augustus in 177. Despite being the son of a previous emperor and having nominally shared government with him, Commodus' rule ended with his murder at the hands of his own soldiers. From his death in 192 until
36863-602: Was the real "usurper" (having been proclaimed by his troops). There were no true objective legal criteria for being acclaimed emperor beyond acceptance by the Roman army , which was really the true basis of imperial power. Common methods used by emperors to assert claims of legitimacy, such as support of the army, blood connections (sometimes fictitious) to past emperors, distributing one's own coins or statues, and claims to pre-eminent virtue through propaganda, were pursued just as well by many usurpers as they were by legitimate emperors. Septimius Severus notably declared himself as
37056-473: Was the ruler and monarchical head of state of the Roman Empire , starting with the granting of the title augustus to Octavian in 27 BC. The term emperor is a modern convention, and did not exist as such during the Empire. When a given Roman is described as becoming emperor in English, it generally reflects his accession as augustus , and later as basileus . Another title used
37249-408: Was the title used by early writers before the term imperator became popular. In his Res Gestae , Augustus explicitly refers to himself as the princeps senatus . The title was also sometimes given to heirs, in the form of princeps iuventutis ("first of the youth"), a term that continued to be used during the Tetrarchy . In the era of Diocletian and beyond, princeps fell into disuse and
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