Misplaced Pages

#951048

134-399: The name "alum" is also used, more generally, for salts with the same formula and structure, except that aluminium is replaced by another trivalent metal ion like chromium , and/or sulfur is replaced by another chalcogen like selenium . The most common of these analogs is chrome alum KCr(SO 4 ) 2 ·12 H 2 O . In most industries, the name "alum" (or "papermaker's alum")

268-482: A certain degree of astringency , and were all employed for dyeing and medicine. Pliny wrote that there is another kind of alum that the ancient Greeks term schiston , and which "splits into filaments of a whitish colour". From the name schiston and the mode of formation, it seems that this kind was the salt that forms spontaneously on certain salty minerals, as alum slate and bituminous shale , and consists mainly of sulfates of iron and aluminium. One kind of alumen

402-421: A few families and still others lived on isolated farms spread over the countryside. There were also areas where the pattern was a mix of two or more of those systems. Unlike in the late Roman period, there was no sharp break between the legal status of the free peasant and the aristocrat, and it was possible for a free peasant's family to rise into the aristocracy over several generations through military service to

536-601: A king to rule over them all. By the late sixth century, this arrangement had been replaced by a permanent monarchy, the Kingdom of the Lombards . The invasions brought new ethnic groups to Europe, although some regions received a larger influx of new peoples than others. In Gaul for instance, the invaders settled much more extensively in the north-east than in the south-west. Slavs settled in Central and Eastern Europe and

670-464: A perfume-free deodorant (antiperspirant), and unprocessed mineral alum is sold in Indian bazaars for just that purpose. Throughout Island Southeast Asia , potassium alum is most widely known as tawas and has numerous uses. It is used as a traditional antiperspirant and deodorant, and in traditional medicine for open wounds and sores. The crystals are usually ground into a fine powder before use. During

804-567: A powerful lord. Roman city life and culture changed greatly in the early Middle Ages. Although Italian cities remained inhabited, they contracted significantly in size. Rome, for instance, shrank from a population of hundreds of thousands to around 30,000 by the end of the 6th century. Roman temples were converted into Christian churches and city walls remained in use. In Northern Europe, cities also shrank, while civic monuments and other public buildings were raided for building materials. The establishment of new kingdoms often meant some growth for

938-466: A practical skill rather than a sign of elite status. In the 4th century, Jerome (d. 420) dreamed that God rebuked him for spending more time reading Cicero than the Bible . By the 6th century, Gregory of Tours (d. 594) had a similar dream, but instead of being chastised for reading Cicero, he was chastised for learning shorthand . By the late 6th century, the principal means of religious instruction in

1072-474: A small foothold in southern Spain. Justinian's reconquests have been criticised by historians for overextending his realm and setting the stage for the early Muslim conquests , but many of the difficulties faced by Justinian's successors were due not just to over-taxation to pay for his wars but to the essentially civilian nature of the empire, which made raising troops difficult. In the Eastern Empire

1206-565: A substance termed alumen occurs in the Roman Pliny the Elder 's Natural History . By comparing Pliny's description with the account of stypteria (στυπτηρία) given by Dioscorides , it is obvious the two are identical. Pliny informs us that a form of alumen was found naturally in the earth, and terms it salsugoterrae . Pliny wrote that different substances were distinguished by the name of alumen , but they were all characterised by

1340-622: A sweetish taste, react as acid by turning blue litmus to red, and crystallize in regular octahedra . In alums each metal ion is surrounded by six water molecules. When heated, they liquefy, and if the heating is continued, the water of crystallization is driven off, the salt froths and swells, and at last an amorphous powder remains. They are astringent and acidic. Alums crystallize in one of three different crystal structures. These classes are called α-, β- and γ-alums. The first X-ray crystal structures of alums were reported in 1927 by James M. Cork and Lawrence Bragg , and were used to develop

1474-439: A trivalent metal does not form a caesium alum, it neither will form an alum with any other alkali metal or with ammonium. Selenium or selenate alums are also known that contain selenium in place of sulfur in the sulfate anion, making selenate ( SeO 4 ) instead. They are strong oxidizing agents . In some cases, solid solutions of alums with different monovalent and trivalent cations may occur. In addition to

SECTION 10

#1732772018952

1608-542: A valuable commodity in The Histories . The production of potassium alum from alunite is archaeologically attested on the island Lesbos . The site was abandoned during the 7th century CE, but dates back at least to the 2nd century CE. Native alumen from the island of Melos appears to have been a mixture mainly of alunogen ( Al 2 (SO 4 ) 3 ·17 H 2 O ) with potassium alum and other minor sulfates. A detailed description of

1742-589: Is potassium alum . It has been used since antiquity as a flocculant to clarify turbid liquids, as a mordant in dyeing , and in tanning . It is still widely used in water treatment , for medicine, for cosmetics (in deodorant ), for food preparation (in baking powder and pickling ), and to fire-proof paper and cloth. Alum is also used as a styptic , in styptic pencils available from pharmacists, or as an alum block, available from barber shops and gentlemen's outfitters, to stem bleeding from shaving nicks; and as an astringent . An alum block can be used directly as

1876-494: Is a double salt , composed of sulfuric acid, alumina, and potash. In the same journal volume, Chaptal published the analysis of four different kinds of alum, namely, Roman alum, Levant alum, British alum, and an alum manufactured by himself, confirming Vauquelin 's result. Some alums occur as minerals, the most important being alunite . The most important alums – potassium, sodium, and ammonium – are produced industrially. Typical recipes involve combining aluminium sulfate and

2010-520: Is a double sulfate of the typical formula X SO 4 · Y 2 (SO 4 ) 3 ·22 H 2 O , such that Double sulfates with the general formula X 2 SO 4 · Y 2 (SO 4 ) 3 ·24 H 2 O are also known, where X is a monovalent cation such as sodium , potassium , rubidium , caesium , thallium , ammonium , or ( NH 4 ), methylammonium ( CH 3 NH 3 ), hydroxylammonium ( HONH 3 ) or hydrazinium ( N 2 H 5 ) and Y

2144-508: Is a monovalent cation, and Y a divalent metal ion. Double sulfates of the composition X 2 SO 4 ·2 Y SO 4 , such that X is a monovalent cation and Y is a divalent metal ion are referred to as langbeinites , after the prototypical potassium magnesium sulfate. Valence (chemistry) Too Many Requests If you report this error to the Wikimedia System Administrators, please include

2278-456: Is a trivalent metal ion, such as aluminium , chromium , titanium , manganese , vanadium , iron , cobalt , gallium , molybdenum , indium , ruthenium , rhodium , or iridium . Analogous selenates also occur. The possible combinations of univalent cation, trivalent cation, and anion depends on the sizes of the ions . A Tutton salt is a double sulfate of the typical formula X 2 SO 4 Y SO 4 ·6H 2 O , where X

2412-406: Is an alkali metal or ammonium , Y is a trivalent metal, and n often is 12. The most important example is chrome alum , KCr(SO 4 ) 2 ·12 H 2 O , a dark violet crystalline double sulfate of chromium and potassium, was used in tanning . In general, alums are formed more easily when the alkali metal atom is larger. This rule was first stated by Locke in 1902, who found that if

2546-456: Is because alum does not react chemically to any significant degree with any of these metals, but will corrode carbon steel. When heat is applied to an alum mixture holding a piece of work that has a drill bit stuck in it, if the lost bit is small enough, it can sometimes be dissolved / removed within hours. Many trivalent metals are capable of forming alums. The general form of an alum is XY (SO 4 ) 2 · n   H 2 O , where X

2680-672: Is no universally agreed upon end date. Depending on the context, events such as the conquest of Constantinople by the Turks in 1453, Christopher Columbus 's first voyage to the Americas in 1492, or the Protestant Reformation in 1517 are sometimes used. English historians often use the Battle of Bosworth Field in 1485 to mark the end of the period. For Spain, dates commonly used are the death of King Ferdinand II in 1516,

2814-713: Is one of the three major periods in the most enduring scheme for analysing European history : classical civilisation or Antiquity , the Middle Ages and the Modern Period . The "Middle Ages" first appears in Latin in 1469 as media tempestas or "middle season". In early usage, there were many variants, including medium aevum , or "middle age", first recorded in 1604, and media saecula , or "middle centuries", first recorded in 1625. The adjective "medieval" (or sometimes "mediaeval" or "mediæval"), meaning pertaining to

SECTION 20

#1732772018952

2948-760: Is used to refer to aluminium sulfate , Al 2  (SO 4 ) 3 · n   H 2 O , which is used for most industrial flocculation (the variable n is an integer whose size depends on the amount of water absorbed into the alum). For medicine , the word "alum" may also refer to aluminium hydroxide gel used as a vaccine adjuvant . The western desert of Egypt was a major source of alum substitutes in antiquity. These evaporites were mainly FeAl 2 (SO 4 ) 4 ·22 H 2 O , MgAl 2 (SO 4 ) 4 ·22 H 2 O , NaAl(SO 4 ) 2 ·6 H 2 O , MgSO 4 ·7H 2 O and Al 2 (SO 4 ) 3 ·17 H 2 O . The Ancient Greek Herodotus mentions Egyptian alum as

3082-539: The fyrd , which were led by the local elites. In military technology, one of the main changes was the return of the crossbow , which had been known in Roman times and reappeared as a military weapon during the last part of the Early Middle Ages. Another change was the introduction of the stirrup, which increased the effectiveness of cavalry as shock troops. A technological advance that had implications beyond

3216-717: The Alans , Vandals , and Suevi crossed into Gaul ; over the next three years they spread across Gaul and in 409 crossed the Pyrenees Mountains into modern-day Spain. The Migration Period began, when various peoples, initially largely Germanic peoples , moved across Europe. The Franks , Alemanni , and the Burgundians all ended up in northern Gaul while the Angles , Saxons , and Jutes settled in Britain , and

3350-529: The Benedictine Rule for Western monasticism during the 6th century, detailing the administrative and spiritual responsibilities of a community of monks led by an abbot . Monks and monasteries had a deep effect on the religious and political life of the Early Middle Ages, in various cases acting as land trusts for powerful families, centres of propaganda and royal support in newly conquered regions, and bases for missions and proselytisation. They were

3484-531: The Desert Fathers of Egypt and Syria . Most European monasteries were of the type that focuses on community experience of the spiritual life, called cenobitism , which was pioneered by Pachomius (d. 348) in the 4th century. Monastic ideals spread from Egypt to Western Europe in the 5th and 6th centuries through hagiographical literature such as the Life of Anthony . Benedict of Nursia (d. 547) wrote

3618-555: The East-West Schism of 1054 . The Crusades , first preached in 1095, were military attempts by Western European Christians to regain control of the Holy Land from Muslims . Kings became the heads of centralised nation-states , reducing crime and violence but making the ideal of a unified Christendom more distant. Intellectual life was marked by scholasticism , a philosophy that emphasised joining faith to reason, and by

3752-532: The Gregorian chant in liturgical music for the churches. An important activity for scholars during this period was the copying, correcting, and dissemination of basic works on religious and secular topics, with the aim of encouraging learning. New works on religious topics and schoolbooks were also produced. Grammarians of the period modified the Latin language, changing it from the Classical Latin of

3886-714: The Macedonian dynasty . Commerce revived and the emperors oversaw the extension of a uniform administration to all the provinces. The military was reorganised, which allowed the emperors John I (r. 969–976) and Basil II (r. 976–1025) to expand the frontiers of the empire on all fronts. The imperial court was the centre of a revival of classical learning, a process known as the Macedonian Renaissance . Writers such as John Geometres ( fl. early 10th century) composed new hymns, poems, and other works. Missionary efforts by both Eastern and Western clergy resulted in

4020-500: The Middle Ages , alchemists and other writers do not seem to have distinguished the two salts accurately. In the writings of the alchemists we find the words misy , sory , and chalcanthum applied to either compound; and the name atramentum sutorium , which one might expect to belong exclusively to green vitriol, applied indiscriminately to both. Alum was the most common mordant (substance used to set dyes on fabrics) used by

4154-635: The fall of the Western Roman Empire and transitioned into the Renaissance and the Age of Discovery . The Middle Ages is the middle period of the three traditional divisions of Western history: classical antiquity , the medieval period, and the modern period . The medieval period is itself subdivided into the Early , High , and Late Middle Ages . Population decline , counterurbanisation ,

Alum - Misplaced Pages Continue

4288-478: The phase retrieval technique isomorphous replacement . The solubility of the various alums in water varies greatly, sodium alum being soluble readily in water, while caesium and rubidium alums are only slightly soluble. The various solubilities are shown in the following table. At temperature T , 100 parts water dissolve: Aluminium-based alums have been used since antiquity, and are still important for many industrial processes. The most widely used alum

4422-408: The 17th-century German historian Christoph Cellarius divided history into three periods: ancient, medieval, and modern. The most commonly given starting point for the Middle Ages is around 500, with the date of 476 first used by Bruni. Later starting dates are sometimes used in the outer parts of Europe. For Europe as a whole, 1500 is often considered to be the end of the Middle Ages, but there

4556-526: The 19th century, alum was used along with other substances like plaster of Paris to adulterate certain food products, particularly bread. It was used to make lower-grade flour appear whiter, allowing the producers to spend less on whiter flour. Because it retains water, it would make the bread heavier, meaning that merchants could charge more for it in their shops. The amount of alum present in each loaf of bread could reach concentrations that would be toxic to humans and cause chronic diarrhea, which could result in

4690-478: The 5th and the 7th centuries, going first to England and Scotland and then on to the continent. Under such monks as Columba (d. 597) and Columbanus (d. 615), they founded monasteries, taught in Latin and Greek, and authored secular and religious works. The Early Middle Ages witnessed the rise of monasticism in the West. The shape of European monasticism was determined by traditions and ideas that originated with

4824-731: The 5th century. The Eastern Empire was marked by closer relations between the political state and Christian Church, with doctrinal matters assuming an importance in Eastern politics that they did not have in Western Europe. Legal developments included the codification of Roman law ; the first effort—the Codex Theodosianus —was completed in 438. Under Emperor Justinian (r. 527–565), another compilation took place—the Corpus Juris Civilis . Justinian also oversaw

4958-685: The 6th and 7th centuries, all of them ruled by the Merovingian dynasty, who were descended from Clovis. The 7th century was a tumultuous period of wars between Austrasia and Neustria. Such warfare was exploited by Pippin (d. 640), the Mayor of the Palace for Austrasia who became the power behind the Austrasian throne. Later members of his family inherited the office, acting as advisers and regents. One of his descendants, Charles Martel (d. 741), won

5092-651: The Arabs. The migrations and invasions of the 4th and 5th centuries disrupted trade networks around the Mediterranean. African goods stopped being imported into Europe, first disappearing from the interior and by the 7th century found only in a few cities such as Rome or Naples . By the end of the 7th century, under the impact of the Muslim conquests , African products were no longer found in Western Europe. The replacement of goods from long-range trade with local products

5226-536: The Bald received the western Frankish lands, comprising most of modern-day France. Charlemagne's grandsons and great-grandsons divided their kingdoms between their descendants, eventually causing all internal cohesion to be lost. In 987 the Carolingian dynasty was replaced in the western lands, with the crowning of Hugh Capet (r. 987–996) as king. In the eastern lands the dynasty had died out earlier, in 911, with

5360-551: The Balkan Peninsula. The settlement of peoples was accompanied by changes in languages. Latin , the literary language of the Western Roman Empire, was gradually replaced by vernacular languages which evolved from Latin, but were distinct from it, collectively known as Romance languages . These changes from Latin to the new languages took many centuries. Greek remained the language of the Byzantine Empire, but

5494-643: The Battle of Poitiers in 732, halting the advance of Muslim armies across the Pyrenees. Great Britain was divided into small states dominated by the kingdoms of Northumbria , Mercia , Wessex , and East Anglia which descended from the Anglo-Saxon invaders. Smaller kingdoms in present-day Wales and Scotland were still under the control of the native Britons and Picts . Ireland was divided into even smaller political units, usually known as tribal kingdoms, under

Alum - Misplaced Pages Continue

5628-577: The Byzantine Empire, as the assumption of the imperial title by the Carolingians asserted their equivalence to the Byzantine state. There were several differences between the newly established Carolingian Empire and both the older Western Roman Empire and the concurrent Byzantine Empire. The Frankish lands were rural in character, with only a few small cities. Most of the people were peasants settled on small farms. Little trade existed and much of that

5762-523: The Byzantine Empire, which he sealed with the marriage of his son Otto II (r. 967–983) to Theophanu (d. 991), daughter of an earlier Byzantine Emperor Romanos II (r. 959–963). By the late 10th century Italy had been drawn into the Ottonian sphere after a period of instability; Otto III (r. 996–1002) spent much of his later reign in the kingdom. The western Frankish kingdom was more fragmented, and although kings remained nominally in charge, much of

5896-648: The Christian period as nova (or "new"). Petrarch regarded the post-Roman centuries as " dark " compared to the "light" of classical antiquity . Leonardo Bruni was the first historian to use tripartite periodisation in his History of the Florentine People (1442), with a middle period "between the fall of the Roman Empire and the revival of city life sometime in late eleventh and twelfth centuries". Tripartite periodisation became standard after

6030-660: The Church had widened to the extent that the cultural and religious differences were greater than the similarities. The formal break, known as the East–West Schism , came in 1054, when the papacy and the patriarchy of Constantinople clashed over papal supremacy and excommunicated each other, which led to the division of Christianity into two Churches—the Western branch became the Roman Catholic Church and

6164-499: The Church had become music and art rather than the book. Most intellectual efforts went towards imitating classical scholarship, but some original works were created, along with now-lost oral compositions. The writings of Sidonius Apollinaris (d. 489), Cassiodorus (d. c.  585 ), and Boethius (d. c. 525) were typical of the age. Changes also took place among laymen, as aristocratic culture focused on great feasts held in halls rather than on literary pursuits. Clothing for

6298-704: The Dnieper River in modern Ukraine to the Adriatic Sea. By 1018, the last Bulgarian nobles had surrendered to the Byzantine Empire. Few large stone buildings were constructed between the Constantinian basilicas of the 4th century and the 8th century, although many smaller ones were built during the 6th and 7th centuries. By the beginning of the 8th century, the Carolingian Empire revived the basilica form of architecture. One feature of

6432-585: The Early Middle Ages are mostly illuminated manuscripts and carved ivories , originally made for metalwork that has since been melted down. Objects in precious metals were the most prestigious form of art, but almost all are lost except for a few crosses such as the Cross of Lothair , several reliquaries , and finds such as the Anglo-Saxon burial at Sutton Hoo and the hoards of Gourdon from Merovingian France, Guarrazar from Visigothic Spain and Nagyszentmiklós near Byzantine territory. There are survivals from

6566-530: The Eastern branch the Eastern Orthodox Church . The ecclesiastical structure of the Roman Empire survived the movements and invasions in the west mostly intact, but the papacy was little regarded, and few of the Western bishops looked to the bishop of Rome for religious or political leadership. Many of the popes prior to 750 were more concerned with Byzantine affairs and Eastern theological controversies. The register, or archived copies of

6700-538: The Eastern emperors to pay tribute. They remained a strong power until 796. An additional problem to face the empire came as a result of the involvement of Emperor Maurice (r. 582–602) in Persian politics when he intervened in a succession dispute . This led to a period of peace, but when Maurice was overthrown, the Persians invaded and during the reign of Emperor Heraclius (r. 610–641) controlled large chunks of

6834-492: The European population remained rural peasants. Many were no longer settled in isolated farms but had gathered into small communities, usually known as manors or villages. These peasants were often subject to noble overlords and owed them rents and other services, in a system known as manorialism . There remained a few free peasants throughout this period and beyond, with more of them in the regions of Southern Europe than in

SECTION 50

#1732772018952

6968-733: The Frankish King Charles the Simple (r. 898–922) to settle in what became Normandy . The eastern parts of the Frankish kingdoms, especially Germany and Italy, were under continual Magyar assault until the invader's defeat at the Battle of Lechfeld in 955. The breakup of the Abbasid dynasty meant that the Islamic world fragmented into smaller political states, some of which began expanding into Italy and Sicily, as well as over

7102-578: The Franks and Celtic Britons set up small polities. Francia was centred in northern Gaul, and the first king of whom much is known is Childeric I (d. 481). His grave was discovered in 1653 and is remarkable for its grave goods , which included weapons and a large quantity of gold. Under Childeric's son Clovis I (r. 509–511), the founder of the Merovingian dynasty , the Frankish kingdom expanded and converted to Christianity. The Britons, related to

7236-685: The German tried to annex all of East Francia. Louis the Pious died in 840, with the empire still in chaos. A three-year civil war followed his death. By the Treaty of Verdun (843), a kingdom between the Rhine and Rhone rivers was created for Lothair to go with his lands in Italy, and his imperial title was recognised. Louis the German was in control of Bavaria and the eastern lands in modern-day Germany. Charles

7370-700: The Great (d. 526) and set up a kingdom marked by its co-operation between the Italians and the Ostrogoths, at least until the last years of Theodoric's reign. The Burgundians settled in Gaul, and after an earlier realm was destroyed by the Huns in 436, formed a new kingdom in the 440s. Between today's Geneva and Lyon , it grew to become the realm of Burgundy in the late 5th and early 6th centuries. Elsewhere in Gaul,

7504-516: The Italian peninsula was conquered by the Ostrogoths . The Eastern Roman Empire, often referred to as the Byzantine Empire after the fall of its western counterpart, had little ability to assert control over the lost western territories. The Byzantine emperors maintained a claim over the territory, but while none of the new kings in the west dared to elevate himself to the position of emperor of

7638-559: The Lombards, which freed the papacy from the fear of Lombard conquest and marked the beginnings of the Papal States . The coronation of Charlemagne as emperor on Christmas Day 800 is regarded as a turning point in medieval history, marking a return of the Western Roman Empire, since the new emperor ruled over much of the area previously controlled by the Western emperors. It also marks a change in Charlemagne's relationship with

7772-405: The Mediterranean, pottery remained prevalent and appears to have been traded over medium-range networks, not just produced locally. The various Germanic states in the west all had coinages that imitated existing Roman and Byzantine forms. Gold continued to be minted until the end of the 7th century in 693-94 when it was replaced by silver in the Merovingian kingdom. The basic Frankish silver coin

7906-411: The Middle Ages, derives from medium aevum . Medieval writers divided history into periods such as the " Six Ages " or the " Four Empires ", and considered their time to be the last before the end of the world. When referring to their own times, they spoke of them as being "modern". In the 1330s, the Italian humanist and poet Petrarch referred to pre-Christian times as antiqua (or "ancient") and to

8040-788: The Middle East than Europe, losing control of sections of the Muslim lands. Umayyad descendants took over the Iberian Peninsula, the Aghlabids controlled North Africa, and the Tulunids became rulers of Egypt. By the middle of the 8th century, new trading patterns were emerging in the Mediterranean; trade between the Franks and the Arabs replaced the old Roman economy . Franks traded timber, furs, swords and slaves in return for silks and other fabrics, spices, and precious metals from

8174-501: The Pyrenees into the southern parts of the Frankish kingdoms. Efforts by local kings to fight the invaders led to the formation of new political entities. In Anglo-Saxon England , King Alfred the Great (r. 871–899) came to an agreement with the Viking invaders in the late 9th century, resulting in Danish settlements in Northumbria, Mercia, and parts of East Anglia. By the middle of the 10th century, Alfred's successors had conquered Northumbria, and restored English control over most of

SECTION 60

#1732772018952

8308-415: The Rhine and eastwards, leaving Charles West Francia with the empire to the west of the Rhineland and the Alps. Louis the German (d. 876), the middle child, who had been rebellious to the last, was allowed to keep Bavaria under the suzerainty of his elder brother. The division was disputed. Pepin II of Aquitaine (d. after 864), the emperor's grandson, rebelled in a contest for Aquitaine , while Louis

8442-515: The Roman Empire into a more flexible form to fit the needs of the Church and government. By the reign of Charlemagne, the language had so diverged from the classical Latin that it was later called Medieval Latin . Charlemagne planned to continue the Frankish tradition of dividing his kingdom between all his heirs, but was unable to do so as only one son, Louis the Pious (r. 814–840), was still alive by 813. Just before Charlemagne died in 814, he crowned Louis as his successor. Louis's reign of 26 years

8576-443: The Romans and the invaders are often similar, and tribal items were often modelled on Roman objects. Much of the scholarly and written culture of the new kingdoms was also based on Roman intellectual traditions. An important difference was the gradual loss of tax revenue by the new polities. Many of the new political entities no longer supported their armies through taxes, instead relying on granting them land or rents. This meant there

8710-423: The Vandals went on to cross the strait of Gibraltar after which they conquered the province of Africa . In the 430s the Huns began invading the empire; their king Attila (r. 434–453) led invasions into the Balkans in 442 and 447, Gaul in 451, and Italy in 452. The Hunnic threat remained until Attila's death in 453, when the Hunnic confederation he led fell apart. These invasions by the tribes completely changed

8844-455: The West were not uniform; some areas had greatly fragmented landholding patterns, but in other areas large contiguous blocks of land were the norm. These differences allowed for a wide variety of peasant societies, some dominated by aristocratic landholders and others having a great deal of autonomy. Land settlement also varied greatly. Some peasants lived in large settlements that numbered as many as 700 inhabitants. Others lived in small groups of

8978-453: The acceptance of figurative monumental sculpture in Christian art , and by the end of the period near life-sized figures such as the Gero Cross were common in important churches. During the later Roman Empire, the principal military developments were attempts to create an effective cavalry force as well as the continued development of highly specialised types of troops. The creation of heavily armoured cataphract -type soldiers as cavalry

9112-599: The alums, which are dodecahydrates, double sulfates and selenates of univalent and trivalent cations occur with other degrees of hydration. These materials may also be referred to as alums, including the undecahydrates such as mendozite and kalinite , hexahydrates such as guanidinium [ CH 6 N 3 ] and dimethylammonium [ (CH 3 )2NH 2 ] "alums", tetrahydrates such as goldichite , monohydrates such as thallium plutonium sulfate and anhydrous alums ( yavapaiites ). These classes include differing, but overlapping, combinations of ions. A pseudo alum

9246-417: The basilica is the use of a transept , or the "arms" of a cross-shaped building that are perpendicular to the long nave . Other new features of religious architecture include the crossing tower and a monumental entrance to the church , usually at the west end of the building. Carolingian art was produced for a small group of figures around the court, and the monasteries and churches they supported. It

9380-407: The city of Byzantium as the newly renamed eastern capital, Constantinople . Diocletian's reforms strengthened the governmental bureaucracy, reformed taxation, and strengthened the army, which bought the empire time but did not resolve the problems it was facing: excessive taxation, a declining birthrate, and pressures on its frontiers, among others. Civil war between rival emperors became common in

9514-416: The collapse of centralized authority, invasions, and mass migrations of tribes , which had begun in Late Antiquity , continued into the Early Middle Ages. The large-scale movements of the Migration Period , including various Germanic peoples , formed new kingdoms in what remained of the Western Roman Empire. In the 7th century, North Africa and the Middle East—once part of the Byzantine Empire —came under

9648-469: The concentrated solution. In 1767, Torbern Bergman observed the need for potassium or ammonium sulfates to convert aluminium sulfate into alum, while sodium or calcium would not work. The composition of common alum was determined finally by Louis Vauquelin in 1797. As soon as Martin Klaproth discovered the presence of potassium in leucite and lepidolite , Vauquelin demonstrated that common alum

9782-599: The conquest of North Africa sundered maritime connections between those areas. Increasingly, the Byzantine Church differed in language, practices, and liturgy from the Western Church. The Eastern Church used Greek instead of the Western Latin. Theological and political differences emerged, and by the early and middle 8th century issues such as iconoclasm , clerical marriage , and state control of

9916-739: The construction of the Hagia Sophia in Constantinople and the reconquest of North Africa from the Vandals and Italy from the Ostrogoths, under Belisarius (d. 565). The conquest of Italy was not complete, as a deadly outbreak of plague in 542 led to the rest of Justinian's reign concentrating on defensive measures rather than further conquests. At the Emperor's death, the Byzantines had control of most of Italy , North Africa, and

10050-551: The control of kings. There were perhaps as many as 150 local kings in Ireland, of varying importance. The Carolingian dynasty , as the successors to Charles Martel are known, officially took control of the kingdoms of Austrasia and Neustria in a coup of 753 led by Pippin III (r. 752–768). A contemporary chronicle claims that Pippin sought, and gained, authority for this coup from Pope Stephen II (pope 752–757). Pippin's takeover

10184-638: The conversion of the Moravians , Bulgars , Bohemians , Poles , Magyars, and Slavic inhabitants of the Kievan Rus' . These conversions contributed to the founding of political states in the lands of those peoples—the states of Moravia , Bulgaria , Bohemia , Poland , Hungary, and the Kievan Rus'. Bulgaria, which was founded around 680, at its height reached from Budapest to the Black Sea and from

10318-753: The death of Louis the Child , and the selection of the unrelated Conrad I (r. 911–918) as king. The breakup of the Carolingian Empire was accompanied by invasions, migrations, and raids by external foes. The Atlantic and northern shores were harassed by the Vikings , who also raided the British Isles and settled there as well as in Iceland. In 911, the Viking chieftain Rollo (d. c. 931) received permission from

10452-401: The death of Queen Isabella I of Castile in 1504, or the conquest of Granada in 1492. Historians from Romance-speaking countries tend to divide the Middle Ages into two parts: an earlier "High" and later "Low" period. English-speaking historians, following their German counterparts, generally subdivide the Middle Ages into three intervals: "Early", "High", and "Late". In the 19th century,

10586-609: The death of young children. Alum is used as a mordant in traditional textiles; and in Indonesia and the Philippines , solutions of tawas , salt , borax , and organic pigments were used to change the color of gold ornaments. In the Philippines, alum crystals were also burned and allowed to drip into a basin of water by babaylan for divination . It is also used in other rituals in the animistic anito religions of

10720-485: The details below. Request from 172.68.168.133 via cp1102 cp1102, Varnish XID 544011148 Upstream caches: cp1102 int Error: 429, Too Many Requests at Thu, 28 Nov 2024 05:33:39 GMT Middle Ages In the history of Europe , the Middle Ages or medieval period lasted approximately from the 5th to the late 15th centuries, similarly to the Post-classical period of global history . It began with

10854-578: The disorder, was killed fighting the Goths at the Battle of Adrianople on 9 August 378. In addition to the threat from such tribal confederacies in the north, internal divisions within the empire, especially within the Christian Church, caused problems. In 400, the Visigoths invaded the Western Roman Empire and, although briefly forced back from Italy, in 410 sacked the city of Rome . In 406

10988-501: The dye industry, especially in Islamic countries, during the middle ages . It was the main export of the Chad region, from where it was transported to the markets of Egypt and Morocco , and then to Europe . Less significant sources were found in Egypt and Yemen . During the early 1700s, G. E. Stahl claimed that reacting sulfuric acid with limestone produced a sort of alum. The error

11122-442: The early Carolingian period, with a growing dominance of elite heavy cavalry. The use of militia-type levies of the free population declined over the Carolingian period. Although much of the Carolingian armies were mounted, a large proportion during the early period appear to have been mounted infantry , rather than true cavalry. One exception was Anglo-Saxon England, where the armies were still composed of regional levies, known as

11256-531: The elites was richly embellished with jewels and gold. Lords and kings supported entourages of fighters who formed the backbone of the military forces. Family ties within the elites were important, as were the virtues of loyalty, courage, and honour. These ties led to the prevalence of the feud in aristocratic society, examples of which included those related by Gregory of Tours that took place in Merovingian Gaul. Most feuds seem to have ended quickly with

11390-591: The emergence of Islam in Arabia during the lifetime of Muhammad (d. 632). After his death, Islamic forces conquered much of the Eastern Roman Empire and Persia, starting with Syria in 634–635, continuing with Persia between 637 and 642, reaching Egypt in 640–641, North Africa in the later seventh century, and the Iberian Peninsula in 711. By 714, Islamic forces controlled much of

11524-403: The empire than tax-payers. The Emperor Diocletian (r. 284–305) split the empire into separately administered eastern and western halves in 286; the empire was not considered divided by its inhabitants or rulers, as legal and administrative promulgations in one division were considered valid in the other. In 330, after a period of civil war, Constantine the Great (r. 306–337) refounded

11658-573: The empire to Christianity , a gradual process that lasted from the 2nd to the 5th centuries. In 376, the Goths , fleeing from the Huns , received permission from Emperor Valens (r. 364–378) to settle in the Roman province of Thracia in the Balkans . The settlement did not go smoothly, and when Roman officials mishandled the situation, the Goths began to raid and plunder. Valens, attempting to put down

11792-447: The empire, including Egypt, Syria, and Anatolia until Heraclius' successful counterattack. In 628 the empire secured a peace treaty and recovered all of its lost territories. In Western Europe, some of the older Roman elite families died out while others became more involved with ecclesiastical than secular affairs. Values attached to Latin scholarship and education mostly disappeared, and while literacy remained important, it became

11926-486: The empire. Such movements were aided by the refusal of the Western Roman elites to support the army or pay the taxes that would have allowed the military to suppress the migration. The emperors of the 5th century were often controlled by military strongmen such as Stilicho (d. 408), Aetius (d. 454), Aspar (d. 471), Ricimer (d. 472), or Gundobad (d. 516), who were partly or fully of non-Roman background. When

12060-454: The entire Middle Ages were often referred to as the " Dark Ages ", but with the adoption of these subdivisions, use of this term was restricted to the Early Middle Ages, at least among historians. The Roman Empire reached its greatest territorial extent during the 2nd century AD; the following two centuries witnessed the slow decline of Roman control over its outlying territories. Economic issues, including inflation, and external pressure on

12194-571: The founding of universities . The theology of Thomas Aquinas , the paintings of Giotto , the poetry of Dante and Chaucer , the travels of Marco Polo , and the Gothic architecture of cathedrals such as Chartres are among the outstanding achievements toward the end of this period and into the Late Middle Ages. The Late Middle Ages was marked by difficulties and calamities including famine, plague, and war, which significantly diminished

12328-635: The frontiers combined to create the Crisis of the Third Century , with emperors coming to the throne only to be rapidly replaced by new usurpers. Military expenses increased steadily during the 3rd century, mainly in response to the war with the Sasanian Empire , which revived in the middle of the 3rd century. The army doubled in size, and cavalry and smaller units replaced the Roman legion as

12462-451: The imperial officials called missi dominici , who served as roving inspectors and troubleshooters. Charlemagne's court in Aachen was the centre of the cultural revival sometimes referred to as the " Carolingian Renaissance ". Literacy increased, as did development in the arts, architecture and jurisprudence, as well as liturgical and scriptural studies. The English monk Alcuin (d. 804)

12596-538: The islands. For traditional Japanese art , alum and animal glue were dissolved in water, forming a liquid known as dousa ( Japanese : 礬水 ), and used as an undercoat for paper sizing . Alum in the form of potassium aluminium sulphate or ammonium aluminium sulfate in a concentrated bath of hot water is regularly used by jewelers and machinists to dissolve hardened steel drill bits that have broken off in items made of aluminum, copper, brass, gold (any karat), silver (both sterling and fine) and stainless steel. This

12730-415: The king of the united Austrasia and Neustria. Charles, more often known as Charles the Great or Charlemagne , embarked upon a programme of systematic expansion in 774 that unified a large portion of Europe, eventually controlling modern-day France, northern Italy, and Saxony . In the wars that lasted beyond 800, he rewarded allies with war booty and command over parcels of land. In 774, Charlemagne conquered

12864-679: The large brooches in fibula or penannular form that were a key piece of personal adornment for elites, including the Irish Tara Brooch . Highly decorated books were mostly Gospel Books and these have survived in larger numbers , including the Insular Book of Kells , the Book of Lindisfarne , and the imperial Codex Aureus of St. Emmeram , which is one of the few to retain its " treasure binding " of gold encrusted with jewels. Charlemagne's court seems to have been responsible for

12998-476: The letters, of Pope Gregory the Great (pope 590–604) survived, and of those more than 850 letters, the vast majority were concerned with affairs in Italy or Constantinople. The only part of Western Europe where the papacy had influence was Britain, where Gregory had sent the Gregorian mission in 597 to convert the Anglo-Saxons to Christianity. Irish missionaries were most active in Western Europe between

13132-417: The line of Western emperors ceased, many of the kings who replaced them were from the same background. Intermarriage between the new kings and the Roman elites was common. This led to a fusion of Roman culture with the customs of the invading tribes, including the popular assemblies that allowed free male tribal members more say in political matters than was common in the Roman state. Material artefacts left by

13266-517: The main and sometimes only outposts of education and literacy in a region. Many of the surviving manuscripts of the Latin classics were copied in monasteries in the Early Middle Ages. Monks were also the authors of new works, including history, theology, and other subjects, written by authors such as Bede (d. 735), a native of northern England who wrote in the late 7th and early 8th centuries. The Frankish kingdom in northern Gaul split into kingdoms called Austrasia , Neustria , and Burgundy during

13400-410: The main tactical unit. The need for revenue led to increased taxes and a decline in numbers of the curial , or landowning, class, and decreasing numbers of them willing to shoulder the burdens of holding office in their native towns. More bureaucrats were needed in the central administration to deal with the needs of the army, which led to complaints from civilians that there were more tax-collectors in

13534-467: The middle of the 4th century, diverting soldiers from the empire's frontier forces and allowing invaders to encroach. For much of the 4th century, Roman society stabilised in a new form that differed from the earlier classical period , with a widening gulf between the rich and poor, and a decline in the vitality of the smaller towns. Another change was the Christianisation , or conversion of

13668-543: The migrations of the Slavs added Slavic languages to Eastern Europe. As Western Europe witnessed the formation of new kingdoms, the Eastern Roman Empire remained intact and experienced an economic revival that lasted into the early 7th century. There were fewer invasions of the eastern section of the empire; most occurred in the Balkans. Peace with the Sasanian Empire , the traditional enemy of Rome, lasted throughout most of

13802-464: The military was the horseshoe , which allowed horses to be used in rocky terrain. The High Middle Ages was a period of tremendous expansion of population . The estimated population of Europe grew from 35 to 80 million between 1000 and 1347, although the exact causes remain unclear: improved agricultural techniques, the decline of slaveholding, a more clement climate and the lack of invasion have all been suggested. As much as 90 per cent of

13936-849: The natives of Britannia  – modern-day Great Britain – settled in what is now Brittany . Other monarchies were established by the Visigothic Kingdom in the Iberian Peninsula , the Suebi in northwestern Iberia, and the Vandal Kingdom in North Africa . In the sixth century, the Lombards settled in Northern Italy , replacing the Ostrogothic kingdom with a grouping of duchies that occasionally selected

14070-489: The organisation of peasants into villages that owed rent and labour services to the nobles , and feudalism , the political structure whereby knights and lower-status nobles owed military service to their overlords in return for the right to rent from lands and manors , were two of the ways society was organized in the High Middle Ages. This period also saw the collapse of the unified Christian church, with

14204-545: The payment of some sort of compensation . Women took part in aristocratic society mainly in their roles as wives and mothers of men, with the role of mother of a ruler being especially prominent in Merovingian Gaul. In Anglo-Saxon society the lack of many child rulers meant a lesser role for women as queen mothers, but this was compensated for by the increased role played by abbesses of monasteries. Only in Italy does it appear that women were always considered under

14338-654: The peninsula in a region they called Al-Andalus . The Islamic conquests reached their peak in the mid-eighth century. The defeat of Muslim forces at the Battle of Tours in 732 led to the reconquest of southern France by the Franks, but the main reason for the halt of Islamic growth in Europe was the overthrow of the Umayyad Caliphate and its replacement by the Abbasid Caliphate . The Abbasids moved their capital to Baghdad and were more concerned with

14472-408: The political and demographic nature of what had been the Western Roman Empire. By the end of the 5th century the western section of the empire was divided into smaller political units, ruled by the tribes that had invaded in the early part of the century. The deposition of the last emperor of the west, Romulus Augustulus , in 476 has traditionally marked the end of the Western Roman Empire. By 493

14606-532: The political power devolved to the local lords. Missionary efforts to Scandinavia during the 9th and 10th centuries helped strengthen the growth of kingdoms such as Sweden , Denmark , and Norway , which gained power and territory. Some kings converted to Christianity, although not all by 1000. Scandinavians also expanded and colonised throughout Europe. Besides the settlements in Ireland, England, and Normandy, further settlement took place in what became Russia and Iceland . Swedish traders and raiders ranged down

14740-628: The population of Europe; between 1347 and 1350, the Black Death killed about a third of Europeans. Controversy, heresy , and the Western Schism within the Catholic Church paralleled the interstate conflict, civil strife, and peasant revolts that occurred in the kingdoms. Cultural and technological developments transformed European society, concluding the Late Middle Ages and beginning the early modern period . The Middle Ages

14874-489: The pressures of internal civil wars combined with external invasions: Vikings from the north, Magyars from the east, and Saracens from the south. During the High Middle Ages, which began after 1000, the population of Europe increased greatly as technological and agricultural innovations allowed trade to flourish and the Medieval Warm Period climate change allowed crop yields to increase. Manorialism ,

15008-419: The protection and control of a male relative. Peasant society is much less documented than the nobility. Most of the surviving information available to historians comes from archaeology ; few detailed written records documenting peasant life remain from before the 9th century. Most of the descriptions of the lower classes come from either law codes or writers from the upper classes. Landholding patterns in

15142-525: The rivers of the Russian steppe, and even attempted to seize Constantinople in 860 and 907 . Christian Spain, initially driven into a small section of the peninsula in the north, expanded slowly south during the 9th and 10th centuries, establishing the kingdoms of Asturias and León . In Eastern Europe, Byzantium revived its fortunes under Emperor Basil I (r. 867–886) and his successors Leo VI (r. 886–912) and Constantine VII (r. 913–959), members of

15276-510: The rule of the Umayyad Caliphate , an Islamic empire, after conquest by Muhammad's successors . Although there were substantial changes in society and political structures, the break with classical antiquity was not complete. The still-sizeable Byzantine Empire, Rome's direct continuation, survived in the Eastern Mediterranean and remained a major power. The empire's law code, the Corpus Juris Civilis or "Code of Justinian",

15410-428: The salt would be white and would be suitable, according to Pliny, for dyeing bright colors. Pliny describes several other types of alumen but it is not clear as to what these minerals are. The alumen of the ancients, then, was not always potassium alum, not even an alkali aluminum sulfate. Alum and green vitriol (iron sulfate) both have sweetish and astringent taste, and they had overlapping uses. Therefore, through

15544-668: The slow infiltration of the Balkans by the Slavs added a further difficulty for Justinian's successors. It began gradually, but by the late 540s Slavic tribes were in Thrace and Illyrium , and had defeated an imperial army near Adrianople in 551. In the 560s the Avars began to expand from their base on the north bank of the Danube ; by the end of the 6th-century, they were the dominant power in Central Europe and routinely able to force

15678-697: The southern part of Great Britain. In northern Britain, Kenneth MacAlpin (d. c. 860) united the Picts and the Scots into the Kingdom of Alba . In the early 10th century, the Ottonian dynasty had established itself in Germany , and was engaged in driving back the Magyars. Its efforts culminated in the coronation in 962 of Otto I (r. 936–973) as Holy Roman Emperor . In 972, he secured recognition of his title by

15812-465: The sulfate monovalent cation. The aluminium sulfate is usually obtained by treating minerals like alum schist , bauxite and cryolite with sulfuric acid. Aluminium-based alums are named by the monovalent cation. Unlike the other alkali metals , lithium does not form alums; a fact attributed to the small size of its ion. The most important alums are Aluminium-based alums have a number of common chemical properties. They are soluble in water , have

15946-497: The towns chosen as capitals. Although there had been Jewish communities in many Roman cities , the Jews suffered periods of persecution after the conversion of the empire to Christianity. Officially they were tolerated, if subject to conversion efforts, and at times were even encouraged to settle in new areas. Religious beliefs in the Eastern Roman Empire and Iran were in flux during the late sixth and early seventh centuries. Judaism

16080-645: The west, Byzantine control of most of the Western Empire could not be sustained; the reconquest of the Mediterranean periphery and the Italian Peninsula ( Gothic War ) in the reign of Justinian (r. 527–565) was the sole, and temporary, exception. The political structure of Western Europe changed with the end of the united Roman Empire. Although the movements of peoples during this period are usually described as "invasions", they were not just military expeditions but migrations of entire peoples into

16214-430: Was a liquid, which was apt to be adulterated; but when pure it had the property of blackening when added to pomegranate juice. This property seems to characterize a solution of iron sulfate in water; a solution of ordinary (potassium) alum would possess no such property. Contamination with iron sulfate was greatly disliked as this darkened and dulled dye colours. In some places the iron sulfate may have been lacking, so

16348-438: Was a trend throughout the old Roman lands that happened in the Early Middle Ages. This was especially marked in the lands that did not lie on the Mediterranean, such as northern Gaul or Britain. Non-local goods appearing in the archaeological record are usually luxury goods. In the northern parts of Europe, not only were the trade networks local, but the goods carried were simple, with little pottery or other complex products. Around

16482-469: Was an active proselytising faith, and at least one Arab political leader converted to it. In addition Jewish theologians wrote polemics defending their religion against Christian and Islamic influences. Christianity had active missions competing with the Persians' Zoroastrianism in seeking converts, especially among residents of the Arabian Peninsula . All these strands came together with

16616-438: Was an important feature of the 5th-century Roman military. The various invading tribes had differing emphases on types of soldiers—ranging from the primarily infantry Anglo-Saxon invaders of Britain to the Vandals and Visigoths who had a high proportion of cavalry in their armies. During the early invasion period, the stirrup had not been introduced into warfare, which limited the usefulness of cavalry as shock troops because it

16750-474: Was dominated by efforts to regain the dignity and classicism of imperial Roman and Byzantine art , but was also influenced by the Insular art of the British Isles. Insular art integrated the energy of Irish Celtic and Anglo-Saxon Germanic styles of ornament with Mediterranean forms such as the book, and established many characteristics of art for the rest of the medieval period. Surviving religious works from

16884-408: Was invited to Aachen and brought the education available in the monasteries of Northumbria. Charlemagne's chancery —or writing office—made use of a new script today known as Carolingian minuscule , allowing a common writing style that advanced communication across much of Europe. Charlemagne sponsored changes in church liturgy , imposing the Roman form of church service on his domains, as well as

17018-493: Was less need for large tax revenues and so the taxation systems decayed. Warfare was common between and within the kingdoms. Slavery declined as the supply weakened, and society became more rural. Between the 5th and 8th centuries, new peoples and individuals filled the political void left by Roman centralised government. The Ostrogoths , a Gothic tribe, settled in Roman Italy in the late fifth century under Theoderic

17152-439: Was marked by numerous divisions of the empire among his sons and, after 829, civil wars between various alliances of father and sons over the control of various parts of the empire. Eventually, Louis recognised his eldest son Lothair I (d. 855) as emperor and gave him Italy. Louis divided the rest of the empire between Lothair and Charles the Bald (d. 877), his youngest son. Lothair took East Francia , comprising both banks of

17286-549: Was not possible to put the full force of the horse and rider behind blows struck by the rider. The greatest change in military affairs during the invasion period was the adoption of the Hunnic composite bow in place of the earlier, and weaker, Scythian composite bow. Another development was the increasing use of longswords and the progressive replacement of scale armour by mail armour and lamellar armour . The importance of infantry and light cavalry began to decline during

17420-536: Was rediscovered in Northern Italy in the 11th century. In the West, most kingdoms incorporated the few extant Roman institutions. Monasteries were founded as campaigns to Christianise pagan Europe continued. The Franks , under the Carolingian dynasty , briefly established the Carolingian Empire during the later 8th and early 9th centuries. It covered much of Western Europe but later succumbed to

17554-503: Was reinforced with propaganda that portrayed the Merovingians as inept or cruel rulers, exalted the accomplishments of Charles Martel, and circulated stories of the family's great piety. At the time of his death in 768, Pippin left his kingdom in the hands of his two sons, Charles (r. 768–814) and Carloman (r. 768–771). When Carloman died of natural causes, Charles blocked the succession of Carloman's young son and installed himself as

17688-443: Was soon corrected by Johann Heinrich Pott and Andreas Sigismund Marggraf , who showed that the precipitate obtained when an alkali is poured into a solution of alum, namely alumina , is quite different from lime and chalk , and is one of the ingredients in common clay . Marggraf also showed that perfect crystals with properties of alum can be obtained by dissolving alumina in sulfuric acid and adding potash or ammonia to

17822-533: Was the denarius or denier , while the Anglo-Saxon version was called a penny . From these areas, the denier or penny spread throughout Europe from 700 to 1000 AD. Copper or bronze coins were not struck, nor were gold except in Southern Europe. No silver coins denominated in multiple units were minted. Christianity was a major unifying factor between Eastern and Western Europe before the Arab conquests, but

17956-409: Was with the British Isles and Scandinavia, in contrast to the older Roman Empire with its trading networks centred on the Mediterranean. The empire was administered by an itinerant court that travelled with the emperor, as well as approximately 300 imperial officials called counts , who administered the counties the empire had been divided into. Clergy and local bishops served as officials, as well as

#951048