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154-518: The beautiful Byzantine structure is today rather incongruously choked on three sides by modern apartment blocks. It stands in Istanbul , in the district of Fatih , in the neighbourhood of Laleli , one kilometre west of the ruins of the Great Palace of Constantinople . Some years before 922, possibly during the wars against Simeon I 's Bulgaria , the droungarios Romanos Lekapenos bought

308-401: A cross-in-square (or quincunx ) plan, with a nine meter long side. The central nave ( naos ) is surmounted by an umbrella dome , with a drum interrupted by arched windows, which gives to the structure an undulating rhythmus. The four side naves are covered by barrel vaults . The edifice has a narthex to the west and a sanctuary to the east. The central bay of the narthex is covered by

462-400: A " whispering gallery " at its base that at certain places transmits distinct sound to other distant places in the gallery. The half-domes over the apses of Byzantine churches helped to project the chants of the clergy. Although this can complement music, it may make speech less intelligible, leading Francesco Giorgi in 1535 to recommend vaulted ceilings for the choir areas of a church, but

616-694: A Turkish city since 1923, it contains many ancient, Roman, Byzantine, Christian, Muslim, and Jewish monuments. The Neolithic settlement in the Yenikapı quarter on the European side, which dates back to c.  6500 BCE and predates the formation of the Bosporus by approximately a millennium, when the Sea of Marmara was still a lake, was discovered during the construction of the Marmaray railway tunnel. It

770-583: A beacon of the Silk Road and one of the most important cities in history. The city played a key role in the advancement of Christianity during Roman/Byzantine times, hosting four of the first seven ecumenical councils before its transformation to an Islamic stronghold following the Fall of Constantinople in 1453 CE—especially after becoming the seat of the Ottoman Caliphate in 1517. In 1923, after

924-488: A center of Greek culture and Christianity. Numerous churches were built across the city, including Hagia Sophia which was built during the reign of Justinian I and remained the world's largest cathedral for a thousand years. Constantine also undertook a major renovation and expansion of the Hippodrome of Constantinople ; accommodating tens of thousands of spectators, the hippodrome became central to civic life and, in

1078-480: A central point. The validity of this is unclear, as domes built underground with corbelled stone layers are in compression from the surrounding earth. The precise definition of "pendentive" has also been a source of academic contention, such as whether or not corbelling is permitted under the definition and whether or not the lower portions of a sail vault should be considered pendentives. Domes with pendentives can be divided into two kinds: simple and compound . In

1232-651: A church, which he intended from the beginning to use as burial place for his family. The first person to be buried there was his wife Theodora , in December 922, followed by his eldest son and co-emperor Christopher , who died in 931. By doing so, Romanos interrupted a six-century-old tradition, whereby almost all the Byzantine emperors since Constantine I were buried in the Church of the Holy Apostles . Later

1386-713: A circle . Because they reduce the portion of the dome in tension, these domes are strong but have increased radial thrust. Many of the largest existing domes are of this shape. Masonry saucer domes, because they exist entirely in compression, can be built much thinner than other dome shapes without becoming unstable. The trade-off between the proportionately increased horizontal thrust at their abutments and their decreased weight and quantity of materials may make them more economical, but they are more vulnerable to damage from movement in their supports. Also called gadrooned , fluted , organ-piped , pumpkin , melon , ribbed , parachute , scalloped , or lobed domes, these are

1540-554: A circular base alone, circular or polygonal base, circular, elliptical, or polygonal base, or an undefined area. Definitions specifying vertical sections include: semicircular, pointed, or bulbous; semicircular, segmental or pointed; semicircular, segmental, pointed, or bulbous; semicircular, segmental, elliptical, or bulbous; and high profile, hemispherical, or flattened. Sometimes called "false" domes, corbel domes achieve their shape by extending each horizontal layer of stones inward slightly farther than

1694-516: A circular base for a drum or compound dome, smoothly continue their curvature to form the dome itself. The dome gives the impression of a square sail pinned down at each corner and billowing upward. These can also be thought of as saucer domes upon pendentives. Sail domes are based upon the shape of a hemisphere and are not to be confused with elliptic parabolic vaults, which appear similar but have different characteristics. In addition to semicircular sail vaults there are variations in geometry such as

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1848-403: A city with above-freezing average temperatures. Istanbul's precipitation is unevenly distributed, with winter months getting at least twice the level of precipitation of their summerly counterparts. The mode of precipitation also varies by season. Winter precipitation is generally light, persistent and often of mixed precipitation such as rain-snow mixes and graupel ; while summer precipitation

2002-492: A cosmopolitan society that persisted through much of the Ottoman period. Revitalizing Istanbul also required a massive program of restorations, of everything from roads to aqueducts . Like many monarchs before and since, Mehmed II transformed Istanbul's urban landscape with wholesale redevelopment of the city center. There was a huge new palace to rival, if not overshadow, the old one , a new covered market (still standing as

2156-413: A dome, the two side bays by cross vaults . The nave is partitioned by four piers , which substituted in the Ottoman period the original columns. Many openings – windows, oeil-de-boeufs and arches – give light to the structure. The exterior of the building is characterized by the half cylindrical buttresses which articulate its façades. Originally an exonarthex existed too, but in the Ottoman period it

2310-429: A dome. The top of a dome is the "crown". The inner side of a dome is called the "intrados" and the outer side is called the "extrados". As with arches, the "springing" of a dome is the base level from which the dome rises and the "haunch" is the part that lies roughly halfway between the base and the top. Domes can be supported by an elliptical or circular wall called a "drum". If this structure extends to ground level,

2464-546: A flat ceiling filled with as many coffers as possible for where preaching would occur. Cavities in the form of jars built into the inner surface of a dome may serve to compensate for this interference by diffusing sound in all directions, eliminating echoes while creating a "divine effect in the atmosphere of worship." This technique was written about by Vitruvius in his Ten Books on Architecture , which describes bronze and earthenware resonators. The material, shape, contents, and placement of these cavity resonators determine

2618-535: A giant fifth century rotunda which, with an external diameter of 41.8 metres (137.1 feet), was the second largest, after the Roman Pantheon , in the ancient world. In the tenth century the rotunda was not used anymore, and then it was converted – possibly by Romanos himself – into a cistern by covering its interior with a vaulted system carried by at least 70 columns . Near the palace the Emperor built

2772-402: A hemispherical dome can be 2.5 times thinner than a semicircular arch, and a dome with the profile of an equilateral arch can be thinner still. The optimal shape for a masonry dome of equal thickness provides for perfect compression, with none of the tension or bending forces against which masonry is weak. For a particular material, the optimal dome geometry is called the funicular surface ,

2926-569: A house in the ninth region of Constantinople , not far from the Sea of Marmara , in the place called Myrelaion ("the place of myrrh " in Greek ). After his accession to the throne this building became the nucleus of a new imperial palace, intended to challenge the neighbouring Great Palace of Constantinople , and the family shrine of the Lekapenos family. The palace of Myrelaion was built on top of

3080-539: A large role in the city's infrastructure development, with over 500,000 vulnerable buildings demolished and replaced since 2012. According to ministry statements and geologist comments made in 2023, the city's infrastructure was in reasonably good shape, however, due to very high costs, buildings were not: over half a million flats were still vulnerable to collapse, and casualties largely depend on how many collapse. As of 2024 , most buildings in Istanbul were built to

3234-516: A limited number of simple elements and joints and efficiently resolve a dome's internal forces. Their efficiency is said to increase with size. Although not first invented by Buckminster Fuller , they are associated with him because he designed many geodesic domes and patented them in the United States. The hemispherical dome is a surface formed by the rotation around a vertical axis of a semicircle . Like other "rotational domes" formed by

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3388-517: A low rise to span ratio or covering a rectangular plan. Sail vaults of all types have a variety of thrust conditions along their borders, which can cause problems, but have been widely used from at least the sixteenth century. The second floor of the Llotja de la Seda is covered by a series of nine meter wide sail vaults. Also called segmental domes (a term sometimes also used for cloister vaults), or calottes , these have profiles of less than half

3542-479: A low seismic standard in the 20th century, and residents think the city is not properly prepared for the earthquake . Istanbul's climate is temperate , and is often described as transitional between the Mediterranean climate typical of the western and southern coasts of Turkey, and the oceanic climate of the northwestern coasts of the country. Much divergence exists in the terminology used to classify

3696-401: A natural toll-gate. Several picturesque islands— Büyükada , Heybeliada , Burgazada , Kınalıada , and five smaller islands—are part of the city. Istanbul's shoreline has grown beyond its natural limits. Large sections of Caddebostan sit on areas of landfill, increasing the total area of the city to 5,343 square kilometers (2,063 sq mi). Despite the myth that seven hills make up

3850-521: A pointed and bulbous tradition inherited by some early Islamic mosques. Modern academic study of the topic has been controversial and confused by inconsistent definitions, such as those for cloister vaults and domical vaults. Dictionary definitions of the term "dome" are often general and imprecise. Generally-speaking, it "is non-specific, a blanket-word to describe an hemispherical or similar spanning element." Published definitions include: hemispherical roofs alone; revolved arches ; and vaults on

4004-553: A powerful mortar. The aggregate transitioned over the centuries to pieces of fired clay, then to Roman bricks. By the sixth century, bricks with large amounts of mortar were the principle vaulting materials. Pozzolana appears to have only been used in central Italy. Brick domes were the favored choice for large-space monumental coverings until the Industrial Age , due to their convenience and dependability. Ties and chains of iron or wood could be used to resist stresses. In

4158-667: A primary urban park, but it has several green areas. Gülhane Park and Yıldız Park were originally included within the grounds of two of Istanbul's palaces — Topkapı Palace and Yıldız Palace —but they were repurposed as public parks in the early decades of the Turkish Republic. Another park, Fethi Paşa Korusu , is on a hillside adjacent to the Bosphorus Bridge in Anatolia, opposite Yıldız Palace in Europe. Along

4312-548: A private burial church of a Byzantine emperor, starting so a tradition typical of the later Komnenian and Palaiologan periods. Moreover, the building represents a beautiful example of the cross-in-square type church, the new architectural type of the middle Byzantine architecture . Istanbul Istanbul is the largest city in Turkey , straddling the Bosporus Strait , the boundary between Europe and Asia. It

4466-477: A rectangular or square space to the round or polygonal base of the dome. The dome's apex may be closed or may be open in the form of an oculus , which may itself be covered with a roof lantern and cupola. Domes have a long architectural lineage that extends back into prehistory . Domes were built in ancient Mesopotamia , and they have been found in Persian , Hellenistic , Roman , and Chinese architecture in

4620-428: A result of Istanbul's exponential growth in the 20th century, a significant portion of the city is composed of gecekondus (literally "built overnight"), referring to illegally constructed squatter buildings. At present, some gecekondu areas are being gradually demolished and replaced by modern mass-housing compounds. Moreover, large scale gentrification and urban renewal projects have been taking place, such as

4774-451: A series of nationwide protests in 2013 covering a wide range of issues. Popular during the summer among Istanbulites is Belgrad Forest , spreading across 5,500 hectares (14,000 acres) at the northern edge of the city. The forest originally supplied water to the city and remnants of reservoirs used during Byzantine and Ottoman times survive. Istanbul is primarily known for its Byzantine and Ottoman architecture. Despite its development as

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4928-519: A set of corridors lined with office buildings, residential towers, shopping centers, and university campuses, and over 2,000,000 m (22,000,000 sq ft) of class-A office space in total. Maslak , Levent , and Bomonti are important nodes within the CBD. The Atatürk Airport corridor is another such edge city -style business, residential and shopping corridor with over 900,000 m (9,700,000 sq ft) of class-A office space. During

5082-450: A single arch or a set of multiple projecting nested arches placed diagonally over an internal corner. Squinch forms also include trumpet arches, niche heads (or half-domes), trumpet arches with "anteposed" arches, and muqarnas arches. Squinches transfer the weight of a dome across the gaps created by the corners and into the walls. Pendentives are triangular sections of a sphere, like concave spandrels between arches, and transition from

5236-564: A single point of origin. Their appearance in northern Russian architecture predates the Tatar occupation of Russia and so is not easily explained as the result of that influence. They became popular in the second half of the 15th century in the Low Countries of Northern Europe, possibly inspired by the finials of minarets in Egypt and Syria, and developed in the 16th and 17th centuries in

5390-588: A smaller diameter dome immediately above them, as in the Hagia Sophia, or a drum and dome, as in many Renaissance and post-Renaissance domes, with both forms resulting in greater height. One of the earliest types of ribbed vault, the first known examples are found in the Great Mosque of Córdoba in the 10th century. Rather than meeting in the center of the dome, the ribs characteristically intersect one another off-center, forming an empty polygonal space in

5544-543: A type of dome divided at the base into curved segments, which follow the curve of the elevation . "Fluted" may refer specifically to this pattern as an external feature, such as was common in Mamluk Egypt . The "ribs" of a dome are the radial lines of masonry that extend from the crown down to the springing. The central dome of the Hagia Sophia uses the ribbed method, which accommodates a ring of windows between

5698-542: A vertical axis of a semi-ellipse . Like other "rotational domes" formed by the rotation of a curve around a vertical axis, ellipsoidal domes have circular bases and horizontal sections and are a type of "circular dome" for that reason. Geodesic domes are the upper portion of geodesic spheres. They are composed of a framework of triangles in a polyhedron pattern. The structures are named for geodesics and are based upon geometric shapes such as icosahedrons , octahedrons or tetrahedrons . Such domes can be created using

5852-522: A whole, Bodrum mosque shows strong analogies with the north church of the Fenari Isa complex. The substructure, in contrast with the building, has an austere and rough aspect. Originally its purpose was only that of bringing the church to the same level of the palace of Lekapenos. After the restoration in the Palaiologan period it was used as burial chapel. This edifice is the first example of

6006-469: Is a large and rapidly expanding city, its urban heat island has been intensifying the effects of climate change. If trends continue, sea level rise is likely to affect city infrastructure, for example Kadıkoy metro station is threatened with flooding. Xeriscaping of green spaces has been suggested, and Istanbul has a climate-change action plan. The natural vegetation of the province is made up of mixed broadleaf forest and pseudo-maquis , reflecting

6160-445: Is acute in İstanbul with cars, buses and taxis causing frequent urban smog , as it is one of the few European cities without a low-emission zone . As of 2019 the city's mean air quality remains at a level so as to affect the heart and lungs of healthy street bystanders during peak traffic hours, and almost 200 days of pollution were measured by the air pollution sensors at Sultangazi , Mecidiyeköy , Alibeyköy and Kağıthane . It

6314-776: Is called a Melon dome. A paraboloid dome is a surface formed by the rotation around a vertical axis of a sector of a parabola. Like other "rotational domes" formed by the rotation of a curve around a vertical axis, paraboloid domes have circular bases and horizontal sections and are a type of "circular dome" for that reason. Because of their shape, paraboloid domes experience only compression, both radially and horizontally. Also called sail vaults , handkerchief vaults , domical vaults (a term sometimes also applied to cloister vaults), pendentive domes (a term that has also been applied to compound domes), Bohemian vaults , or Byzantine domes , this type can be thought of as pendentives that, rather than merely touching each other to form

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6468-728: Is considered the country's economic, cultural and historic capital. The city has a population of over 15 million residents, comprising 19% of the population of Turkey, and is the most populous city in Europe and the world's sixteenth-largest city . The city was founded as Byzantium in the 7th century BCE by Greek settlers from Megara . In 330 CE, the Roman emperor Constantine the Great made it his imperial capital, renaming it first as New Rome ( Ancient Greek : Νέα Ῥώμη Nea Rhomē ; Latin : Nova Roma ) and then finally as Constantinople ( Constantinopolis ) after himself. In 1930,

6622-647: Is generally abrupt and sporadic. Cloudiness, as with precipitation, varies greatly by season. Winters are quite cloudy, with around 20 percent of days being sunny or partly cloudy. Meanwhile, summers experience 60-70 percent of possible sunshine. Snowfall is sporadic, but accumulates virtually every winter; and when it does, it is highly disruptive to city infrastructure. Sea-effect snowstorms with more than 30 centimetres (1 ft) of snowfall happen almost annually, most recently in 2022 . Climate change has caused an increase in Istanbul's heatwaves, droughts, storms, and flooding in Istanbul. Furthermore, as Istanbul

6776-401: Is made a complete and self-supporting ring. The upper portion of a masonry dome is always in compression and is supported laterally, so it does not collapse except as a whole unit and a range of deviations from the ideal in this shallow upper cap are equally stable. Because voussoir domes have lateral support, they can be made much thinner than corresponding arches of the same span. For example,

6930-481: Is not well documented. That the dome was known to early Mesopotamia may explain the existence of domes in both China and the West in the first millennium BC. Another explanation, however, is that the use of the dome shape in construction did not have a single point of origin and was common in virtually all cultures long before domes were constructed with enduring materials. Corbelled stone domes have been found from

7084-516: Is one of the 10 worst cities for NO 2 . However a trial of congestion pricing is planned for the historic peninsula. Algal blooms and red tides were reported in the Sea of Marmara and Bosporus (especially in Golden Horn), and regularly happen in urban lakes such as Lake Büyükçekmece and Küçükçekmece . In June 2021, a marine mucilage wave allegedly caused by water pollution spread to Sea of Marmara. The Fatih district, which

7238-407: Is significant overlap with the term cupola , which may also refer to a dome or a structure on top of a dome. The precise definition of a dome has been a matter of controversy and there are a wide variety of forms and specialized terms to describe them. A dome can rest directly upon a rotunda wall, a drum , or a system of squinches or pendentives used to accommodate the transition in shape from

7392-546: Is the igloo , a shelter built from blocks of compact snow and used by the Inuit , among others. The Himba people of Namibia construct "desert igloos" of wattle and daub for use as temporary shelters at seasonal cattle camps, and as permanent homes by the poor. Extraordinarily thin domes of sun-baked clay 20 feet in diameter, 30 feet high, and nearly parabolic in curve, are known from Cameroon . The historical development from structures like these to more sophisticated domes

7546-517: Is the first to have squinches create a regular octagon as a base for the dome, which then became the standard practice. Cylindrical or polygonal plan tower tombs with conical roofs over domes also exist beginning in the 11th century. The Seljuk Empire 's notables built tomb-towers, called "Turkish Triangles", as well as cube mausoleums covered with a variety of dome forms. Seljuk domes included conical, semi-circular, and pointed shapes in one or two shells. Shallow semi-circular domes are mainly found from

7700-577: Is the oldest known human settlement on the European side of the city. The oldest known human settlement on the Asian side is the Fikirtepe Mound near Kadıköy, with relics dating to the Chalcolithic period c.  5500  – c.  3500 BCE . Dome A dome (from Latin domus ) is an architectural element similar to the hollow upper half of a sphere . There

7854-402: Is thought to be impossible. Istanbul Municipality's Directorate of Earthquake and Ground Research is responsible for analysing the methods to reduce the urban seismic risk , whereas the national government-controlled Disaster and Emergency Management Presidency is responsible for earthquake emergency response , and will be helped by NGOs such as İHH . The threat of major earthquakes plays

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8008-801: The Allies occupied Constantinople on 13 November 1918. The Ottoman Parliament was dissolved by the Allies on 11 April 1920 and the Ottoman delegation led by Damat Ferid Pasha was forced to sign the Treaty of Sèvres on 10 August 1920. Following the Turkish War of Independence (1919–1922), the Grand National Assembly of Turkey in Ankara abolished the Sultanate on 1 November 1922, and

8162-468: The Grand Bazaar ), porticoes, pavilions, walkways, as well as more than a dozen new mosques. Mehmed II turned the ramshackle old town into something that looked like an imperial capital. Social hierarchy was ignored by the rampant plague, which killed the rich and the poor alike in the 16th century. Money could not protect the rich from all the discomforts and harsher sides of Istanbul. Although

8316-542: The Latin Empire in place of the Orthodox Byzantine Empire. Hagia Sophia was converted to a Catholic church in 1204. The Byzantine Empire was restored, albeit weakened, in 1261. Constantinople's churches, defenses, and basic services were in disrepair, and its population had dwindled to a hundred thousand from half a million during the 8th century. After the reconquest of 1261, however, some of

8470-472: The Medieval Greek phrase eis tḕn Pólin ( εἰς τὴν Πόλιν , pronounced [is tim ˈbolin] ), literally 'to the city' and is how Constantinople was referred to by the local Greeks. This reflected its status as the only major city in the vicinity. The importance of Constantinople in the Ottoman world was also reflected by its nickname Dersaadet ( Ottoman Turkish : درساعدت ) meaning

8624-490: The Middle East and Central Asia , domes and drums constructed from mud brick and baked brick were sometimes covered with brittle ceramic tiles on the exterior to protect against rain and snow. The new building materials of the 19th century and a better understanding of the forces within structures from the 20th century opened up new possibilities. Iron and steel beams, steel cables, and pre-stressed concrete eliminated

8778-647: The Neolithic period in the ancient Near East , and in the Middle East to Western Europe from antiquity. The kings of Achaemenid Persia held audiences and festivals in domical tents derived from the nomadic traditions of central Asia. Simple domical mausoleums existed in the Hellenistic period. The remains of a large domed circular hall in the Parthian capital city of Nyssa has been dated to perhaps

8932-516: The Palaiologan restoration . After the Ottoman conquest of Constantinople in 1453, the Myrelaion was converted into a mosque by Grand Vizier Mesih Paşa around the year 1500, during the reign of Bayezid II . The mosque was named after its substructure (the meaning of the Turkish word bodrum is "subterranean vault", "basement"), but was also known under the name of its founder. The edifice

9086-522: The Safavid dynasty (1501–1732) are characterized by a distinctive bulbous profile and are considered the last generation of Persian domes. They are generally thinner than earlier domes and are decorated with a variety of colored glazed tiles and complex vegetal patterns, and they were influential on those of other Islamic styles, such as the Mughal architecture of India. An exaggerated style of onion dome on

9240-406: The Turkish War of Independence , Ankara replaced the city as the capital of the newly formed Republic of Turkey. Istanbul was the 2010 European Capital of Culture . The city has surpassed London and Dubai to become the most visited city in the world, with more than 20 million foreign visitors in 2023. The historic centre of Istanbul is a UNESCO World Heritage Site , and the city hosts

9394-476: The University of Kassel in 1983. A masonry dome produces thrusts downward and outward. They are thought of in terms of two kinds of forces at right angles from one another: meridional forces (like the meridians , or lines of longitude, on a globe) are compressive only, and increase towards the base, while hoop forces (like the lines of latitude on a globe) are in compression at the top and tension at

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9548-565: The ancient world , as well as among a number of indigenous building traditions throughout the world. Dome structures were common in both Byzantine architecture and Sasanian architecture , which influenced that of the rest of Europe and Islam , respectively, in the Middle Ages . The domes of European Renaissance architecture spread from Italy in the early modern period , while domes were frequently employed in Ottoman architecture at

9702-555: The metropolitan area of Istanbul as result of urban sprawl . Istanbul is in north-western Turkey and straddles the Bosporus Strait , which provides the only passage from the Black Sea to the Mediterranean via the Sea of Marmara . Historically, the city has been ideally situated for trade and defense: The confluence of the Sea of Marmara, the Bosporus, and the Golden Horn provide both ideal defense against enemy attack and

9856-510: The 'Gate to Prosperity' in Ottoman Turkish. An alternative view is that the name evolved directly from "Constantinople", with the first and third syllables dropped. Some Ottoman sources of the 17th century, such as Evliya Çelebi , describe it as the common Turkish name of the time; between the late 17th and late 18th centuries, it was also in official use. The first use of the word Islambol ( Ottoman Turkish : اسلامبول ) on coinage

10010-468: The 1930s, when Turkish authorities began to press for the use of Istanbul in foreign languages. Ḳosṭanṭīnīye ( Ottoman Turkish : قسطنطينيه ) and İstanbul were the names used alternatively by the Ottomans during their rule. The name İstanbul ( Ottoman Turkish : استانبول ; pronounced [isˈtanbuɫ] , colloquially [ɯsˈtambuɫ] ) is commonly held to derive from

10164-458: The 1950s the number of dolphin observations has become increasingly rare. Mediterranean monk seals were present in Bosporus, and Princes' Islands and Tuzla shores were seal breeding areas during summer, but they have not been observed in Istanbul since the 1960s and thought to be extinct in the region. Water pollution, overfishing and destruction of coastal habitats caused by urbanization are main threats to Istanbul's marine ecology. Apart from

10318-459: The 1960s as part of the process of Turkification . Further mass expulsions of Greeks took place in 1964–1965. As a result of these policies, the Greek population of Istanbul decreased from 110,000 in 1919 to 2,500 today. From the late 1940s and early 1950s, Istanbul underwent great structural change, as new public squares, boulevards, and avenues were constructed throughout the city, sometimes at

10472-575: The 19th century, leaving only the Galata Tower , to make way for the northward expansion of the city. Galata ( Karaköy ) is today a quarter within the Beyoğlu district, which forms Istanbul's commercial and entertainment center and includes İstiklal Avenue and Taksim Square . Dolmabahçe Palace , the seat of government during the late Ottoman period, is in the Beşiktaş district on the European shore of

10626-404: The 20th century have allowed for large dome-shaped structures that deviate from the traditional compressive structural behavior of masonry domes. Popular usage of the term has expanded to mean "almost any long-span roofing system". The word " cupola " is another word for "dome", and is usually used for a small dome upon a roof or turret . "Cupola" has also been used to describe the inner side of

10780-467: The 5th and 6th centuries, the center of episodes of unrest, including the Nika riots . Constantinople's location also ensured its existence would stand the test of time; for many centuries, its walls and seafront protected Europe against invaders from the east and the advance of Islam. During most of the Middle Ages , the latter part of the Byzantine era, Constantinople was the largest and wealthiest city on

10934-497: The Ankara government, commanded by Şükrü Naili Pasha (3rd Corps), entered the city with a ceremony on 6 October 1923, which has been marked as the "Liberation Day of Istanbul" ( İstanbul'un Kurtuluşu ), and has been commemorated annually since. On 29 October 1923 the Grand National Assembly of Turkey declared the establishment of the Turkish Republic, with Ankara as its capital. Mustafa Kemal Atatürk became

11088-690: The Bosporus, to the north of Beyoğlu. The former village of Ortaköy is within Beşiktaş and gives its name to the Ortaköy Mosque on the Bosporus, near the Bosporus Bridge . Lining both the European and Asian shores of the Bosporus are the historic yalıs , luxurious chalet mansions built by Ottoman aristocrats and elites as summer homes. Inland, north of Taksim Square is the Istanbul Central Business District ,

11242-797: The Bosporus. The settlers built an acropolis adjacent to the Golden Horn on the site of the early Thracian settlements, fueling the nascent city's economy. The city experienced a brief period of Persian rule at the turn of the 5th century BCE, but the Greeks recaptured it during the Greco-Persian Wars . Byzantium then continued as part of the Athenian League and its successor, the Second Athenian League , before gaining independence in 355 BCE. Long allied with

11396-620: The Emperor converted his palace into a nunnery and, after his deposition and death in exile as monk in the island of Prote in June 948, he too was buried in the church. The shrine was ravaged by fire in 1203, during the Fourth Crusade . Abandoned during the Latin occupation of Constantinople (1204–1261), the building was repaired at the end of the thirteenth century, during the period of

11550-406: The European continent and at times the largest in the world. Constantinople is generally considered to be the center and the "cradle of Orthodox Christian civilization ". Constantinople began to decline continuously after the end of the reign of Basil II in 1025. The Fourth Crusade was diverted from its purpose in 1204, and the city was sacked and pillaged by the crusaders. They established

11704-647: The European railway network in the 1880s. Modern facilities, such as a water supply network, electricity, telephones, and trams, were gradually introduced to Constantinople over the following decades, although later than to other European cities. The modernization efforts were not enough to forestall the decline of the Ottoman Empire . With the Young Turk Revolution in 1908, the Ottoman Parliament , closed since 14 February 1878,

11858-551: The European side, and close to the Fatih Sultan Mehmet Bridge , is Emirgan Park , which was known as the Kyparades ('Cypress Forest') during the Byzantine period. In the Ottoman period, it was first granted to Nişancı Feridun Ahmed Bey in the 16th century, before being granted by Sultan Murad IV to the Safavid emir Gûne Han in the 17th century, hence the name Emirgan . The 47-hectare (120-acre) park

12012-522: The European side, near the point of the peninsula ( Sarayburnu ), there was a Thracian settlement during the early 1st millennium BCE. Modern authors have linked it to the Thracian toponym Lygos , mentioned by Pliny the Elder as an earlier name for the site of Byzantium. The history of the city proper begins around 660 BCE, when Greek settlers from Megara established Byzantium on the European side of

12166-531: The Great effectively became the emperor of the whole of the Roman Empire in September 324. Two months later, he laid out the plans for a new, Christian city to replace Byzantium. As the eastern capital of the empire, the city was named Nova Roma ; most called it Constantinople, a name that persisted into the 20th century. On 11 May 330, Constantinople was proclaimed the capital of the Roman Empire, which

12320-608: The Italian word duomo , the German/Icelandic/Danish word dom ("cathedral"), and the English word dome as late as 1656, when it meant a "Town-House, Guild-Hall, State-House, and Meeting-House in a city." The French word dosme came to acquire the meaning of a cupola vault, specifically, by 1660. This French definition gradually became the standard usage of the English dome in the eighteenth century as many of

12474-649: The Netherlands before spreading to Germany, becoming a popular element of the baroque architecture of Central Europe. German bulbous domes were also influenced by Russian and Eastern European domes. The examples found in various European architectural styles are typically wooden. Examples include Kazan Church in Kolomenskoye and the Brighton Pavilion by John Nash . In Islamic architecture, they are typically made of masonry, rather than timber, with

12628-406: The Ottoman period, Üsküdar (then Scutari) and Kadıköy were outside the scope of the urban area, serving as tranquil outposts with seaside yalıs and gardens. But in the second half of the 20th century, the Asian side experienced major urban growth; the late development of this part of the city led to better infrastructure and tidier urban planning when compared with most other residential areas in

12782-544: The Republic's first President . A 1942 wealth tax assessed mainly on non-Muslims led to the transfer or liquidation of many businesses owned by religious minorities. The state-sanctioned 1955 Istanbul pogrom , in which hundreds of Greek men, women and children were attacked and raped and dozens murdered, led to the emigration of most of the remaining Greeks in Istanbul. Government persecution of Greeks and religious minorities, especially Christians , intensified through

12936-565: The Romans, Byzantium officially became a part of the Roman Empire in 73 CE. Byzantium's decision to side with the Roman usurper Pescennius Niger against Emperor Septimius Severus cost it dearly; by the time it surrendered at the end of 195 CE, two years of siege had left the city devastated. Five years later, Severus began to rebuild Byzantium, and the city regained—and, by some accounts, surpassed—its previous prosperity. Constantine

13090-587: The Seljuk era. The double-shell domes were either discontinuous or continuous. The domed enclosure of the Jameh Mosque of Isfahan , built in 1086-7 by Nizam al-Mulk , was the largest masonry dome in the Islamic world at that time, had eight ribs, and introduced a new form of corner squinch with two quarter domes supporting a short barrel vault. In 1088 Tāj-al-Molk, a rival of Nizam al-Mulk, built another dome at

13244-464: The Sultan lived at a safe remove from the masses, and the wealthy and poor tended to live side by side, for the most part Istanbul was not zoned as modern cities are. Opulent houses shared the same streets and districts with tiny hovels. Those rich enough to have secluded country properties had a chance of escaping the periodic epidemics of sickness that blighted Istanbul. The Ottoman dynasty claimed

13398-424: The base, with the transition in a hemispherical dome occurring at an angle of 51.8 degrees from the top. The thrusts generated by a dome are directly proportional to the weight of its materials. Grounded hemispherical domes generate significant horizontal thrusts at their haunches. The outward thrusts in the lower portion of a hemispherical masonry dome can be counteracted with the use of chains incorporated around

13552-711: The beginning of the 21st century, indicate that Istanbul's historic peninsula was settled as far back as the 6th millennium BCE. That early settlement, important in the spread of the Neolithic Revolution from the Near East to Europe, lasted for almost a millennium before being inundated by rising water levels. The first human settlement on the Asian side, the Fikirtepe mound, is from the Copper Age period, with artifacts dating from 5500 to 3500 BCE, On

13706-570: The case of the simple dome , the pendentives are part of the same sphere as the dome itself; however, such domes are rare. In the case of the more common compound dome , the pendentives are part of the surface of a larger sphere below that of the dome itself and form a circular base for either the dome or a drum section. The fields of engineering and architecture have lacked common language for domes, with engineering focused on structural behavior and architecture focused on form and symbolism. Additionally, new materials and structural systems in

13860-467: The center. Geometry is a key element of the designs, with the octagon being perhaps the most popular shape used. Whether the arches are structural or purely decorative remains a matter of debate. The type may have an eastern origin, although the issue is also unsettled. Examples are found in Spain, North Africa, Armenia, Iran, France, and Italy. The ellipsoidal dome is a surface formed by the rotation around

14014-519: The church of Santo Tomás de las Ollas in Spain has an oval dome over its oval plan. Other examples of medieval oval domes can be found covering rectangular bays in churches. Oval plan churches became a type in the Renaissance and popular in the Baroque style. The dome built for the basilica of Vicoforte by Francesco Gallo was one of the largest and most complex ever made. Although the ellipse

14168-505: The circle being considered the most perfect of forms. According to E. Baldwin Smith, from the late Stone Age the dome-shaped tomb was used as a reproduction of the ancestral, god-given shelter made permanent as a venerated home of the dead. The instinctive desire to do this resulted in widespread domical mortuary traditions across the ancient world, from the stupas of India to the tholos tombs of Iberia . By Hellenistic and Roman times,

14322-459: The circumference or with external buttressing, although cracking along the meridians is natural. For small or tall domes with less horizontal thrust, the thickness of the supporting arches or walls can be enough to resist deformation, which is why drums tend to be much thicker than the domes they support. Unlike voussoir arches, which require support for each element until the keystone is in place, domes are stable during construction as each level

14476-420: The city , there are, in fact, more than 50 hills within the city limits. Istanbul's tallest hill, Aydos, is 537 meters (1,762 ft) high. The North Anatolian Fault , under the Sea of Marmara , is locked just south of the city. This fault caused the earthquakes in 1766 and 1894 , and a quake of at least magnitude 7.0 is very likely in the 21st century, though an earthquake with a magnitude above 7.5

14630-439: The city's climate , however. The city's summers are warm to hot and moderately dry, with an average daytime temperature of about 28 °C (82 °F), and less than 7 days of precipitation per month. Despite the generally acceptable temperature range, mid-summer in Istanbul is considered moderately uncomfortable, due to high dew points and relative humidity. Winters, meanwhile, are cool, quite rainy, and relatively snow-rich for

14784-594: The city's monuments were restored, and some, like the two Deesis mosaics in Hagia Sophia and Kariye, were created. Various economic and military policies instituted by Andronikos II Palaiologos , such as the reduction of military forces, weakened the empire and left it vulnerable to attack. In the mid-14th-century, the Ottoman Turks began a strategy of gradually taking smaller towns and cities, cutting off Constantinople's supply routes and strangling it slowly. On 29 May 1453, after an eight-week siege during which

14938-629: The city's name was officially changed to Istanbul, the Turkish rendering of εἰς τὴν Πόλιν eis tḕn Pólin 'to the City', the appellation Greek speakers used since the 11th century to colloquially refer to the city. The city served as an imperial capital for almost 1600 years: during the Byzantine (330–1204), Latin (1204–1261), late Byzantine (1261–1453), and Ottoman (1453–1922) empires. The city grew in size and influence, eventually becoming

15092-432: The city's transitional, Mediterranean-influenced humid temperate climate. Chestnut , oak , elm , linden , ash and locust comprise the most prominent temperate forest genera, while laurel , terebinth , Cercis siliquastrum , broom , red firethorn , and oak species such as Quercus cerris and Quercus coccifera are the most important species of Mediterranean and Submediterranean distribution. Apart from

15246-562: The city. Much of the Asian side of the Bosporus functions as a suburb of the economic and commercial centers in European Istanbul, accounting for a third of the city's population but only a quarter of its employment. However, Kozyatağı – Ataşehir , Altunizade , Kavacık and Ümraniye , all together having around 1.4 million sqm of class-A office space, are now important " edge cities ", i.e. corridors and nodes of business and shopping centers and of tall residential buildings. As

15400-456: The comparable shape in three dimensions to a catenary curve for a two-dimensional arch. Adding a weight to the top of a pointed dome, such as the heavy cupola at the top of Florence Cathedral , changes the optimal shape to more closely match the actual pointed shape of the dome. The pointed profiles of many Gothic domes more closely approximate the optimal dome shape than do hemispheres, which were favored by Roman and Byzantine architects due to

15554-400: The corners of a square bay to the circular base of a dome. The curvature of the pendentives is that of a sphere with a diameter equal to the diagonal of the square bay. Pendentives concentrate the weight of a dome into the corners of the bay. The earliest domes in the Middle East were built with mud-brick and, eventually, with baked brick and stone. Domes of wood allowed for wide spans due to

15708-663: The counter-revolution attempt known as the 31 March incident . A series of wars in the early 20th century, such as the Italo-Turkish War (1911–1912) and the Balkan Wars (1912–1913), plagued the ailing empire's capital and resulted in the 1913 Ottoman coup d'état , which brought the regime of the Three Pashas . The Ottoman Empire joined World War I (1914–1918) on the side of the Central Powers and

15862-443: The dome's surface of revolution, or be straight lengths with the connecting points or nodes lying upon the surface of revolution. Single-layer structures are called frame or skeleton types and double-layer structures are truss types, which are used for large spans. When the covering also forms part of the structural system, it is called a stressed skin type. The formed surface type consists of sheets joined at bent edges to form

16016-553: The domical tholos had become the customary cemetery symbol. Domes and tent-canopies were also associated with the heavens in Ancient Persia and the Hellenistic-Roman world. A dome over a square base reflected the geometric symbolism of those shapes. The circle represented perfection, eternity, and the heavens. The square represented the earth. An octagon was intermediate between the two. The distinct symbolism of

16170-483: The effect they have: reinforcing certain frequencies or absorbing them. Also called a corbelled dome , cribbed dome , or false dome , these are different from a 'true dome' in that they consist of purely horizontal layers. As the layers get higher, each is slightly cantilevered , or corbeled , toward the center until meeting at the top. A monumental example is the Mycenaean Treasury of Atreus from

16324-419: The expense of historical buildings. The overall population of Istanbul began to rapidly increase in the 1970s, as people from Anatolia migrated to the city to find employment in the many new factories that were built on the outskirts of the sprawling metropolis. This sudden, sharp rise in the city's population caused a large demand for housing, and many previously outlying villages and forests became engulfed into

16478-472: The first century AD, showing "...the existence of a monumental domical tradition in Central Asia that had hitherto been unknown and which seems to have preceded Roman Imperial monuments or at least to have grown independently from them." It likely had a wooden dome. Persian architecture likely inherited an architectural tradition of dome-building dating back to the earliest Mesopotamian domes. Due to

16632-952: The first century BC, such as the Tabularium of Rome from 78 BC. Others include the Baths of Antoninus in Carthage (145–160) and the Palatine Chapel at Aachen (13th – 14th century). The most famous example is the Renaissance octagonal dome of Filippo Brunelleschi over the Florence Cathedral. Thomas Jefferson , the third president of the United States, installed an octagonal dome above the West front of his plantation house, Monticello . Also called domes on pendentives or pendentive domes (a term also applied to sail vaults), compound domes have pendentives that support

16786-579: The first examples in Asia Minor date to around 4000 B.C. The geometry was eventually defined using combinations of circular arcs, transitioning at points of tangency. If the Romans created oval domes, it was only in exceptional circumstances. The Roman foundations of the oval plan Church of St. Gereon in Cologne point to a possible example. Domes in the Middle Ages also tended to be circular, though

16940-574: The forefront of Persian architecture as a result. Pre-Islamic domes in Persia are commonly semi-elliptical, with pointed domes and those with conical outer shells being the majority of the domes in the Islamic periods. The area of north-eastern Iran was, along with Egypt, one of two areas notable for early developments in Islamic domed mausoleums, which appear in the tenth century. The Samanid Mausoleum in Transoxiana dates to no later than 943 and

17094-412: The headquarters of numerous Turkish companies, accounting for more than thirty percent of the country's economy . The first known name of the city is Byzantium ( Ancient Greek : Βυζάντιον , Byzántion ), the name given to it at its foundation by Megarian colonists around 657 BCE. Megarian colonists claimed a direct line back to the founders of the city, Byzas, the son of the god Poseidon and

17248-399: The heavenly or cosmic tent stemming from the royal audience tents of Achaemenid and Indian rulers was adopted by Roman rulers in imitation of Alexander the Great , becoming the imperial baldachin . This probably began with Nero , whose " Golden House " also made the dome a feature of palace architecture. The dual sepulchral and heavenly symbolism was adopted by early Christians in both

17402-520: The last Ottoman Sultan, Mehmed VI , was declared persona non grata . Leaving aboard the British warship HMS Malaya on 17 November 1922, he went into exile and died in Sanremo , Italy, on 16 May 1926. The Treaty of Lausanne was signed on 24 July 1923, and the occupation of Constantinople ended with the departure of the last forces of the Allies from the city on 4 October 1923. Turkish forces of

17556-570: The last Roman emperor, Constantine XI , was killed, Sultan Mehmed II "the Conqueror" captured Constantinople . Sultan Mehmed declared Constantinople the new capital of the Ottoman Empire . Hours after the fall of the city, the sultan rode to the Hagia Sophia and summoned an imam to proclaim the shahada , converting the grand cathedral into an imperial mosque due to the city's refusal to surrender peacefully. Mehmed declared himself as

17710-482: The late Bronze Age . A single or double layer space frame in the form of a dome, a braced dome is a generic term that includes ribbed , Schwedler , three-way grid , lamella or Kiewitt , lattice , and geodesic domes . The different terms reflect different arrangements in the surface members. Braced domes often have a very low weight and are usually used to cover spans of up to 150 meters. Often prefabricated, their component members can either lie on

17864-411: The lower one until they meet at the top. A "false" dome may also refer to a wooden dome. The Italian use of the term finto , meaning "false", can be traced back to the 17th century in the use of vaulting made of reed mats and gypsum mortar. "True" domes are said to be those whose structure is in a state of compression, with constituent elements of wedge-shaped voussoirs , the joints of which align with

18018-403: The modern world can be found over religious buildings, legislative chambers, sports stadiums, and a variety of functional structures. The English word "dome" ultimately derives from the ancient Greek and Latin domus ("house"), which, up through the Renaissance, labeled a revered house, such as a Domus Dei , or "House of God", regardless of the shape of its roof. This is reflected in the uses of

18172-660: The most impressive Houses of God were built with monumental domes, and in response to the scientific need for more technical terms. Across the ancient world, curved-roof structures that would today be called domes had a number of different names reflecting a variety of shapes, traditions, and symbolic associations. The shapes were derived from traditions of pre-historic shelters made from various impermanent pliable materials and were only later reproduced as vaulting in more durable materials. The hemispherical shape often associated with domes today derives from Greek geometry and Roman standardization, but other shapes persisted, including

18326-540: The natural flora, Platanus orentalis , horse chestnut , cypress and stone pine make up the introduced species that got acclimatized to Istanbul. In a study that examined urban flora in Kartal , a total of 576 plant taxa were recorded; of those 477 were natural and 99 were exotic and cultivated. The most prominent native taxa were in the Asteraceae family (50 species), while the most diverse exotic plant family

18480-449: The need for external buttressing and enabled much thinner domes. Whereas earlier masonry domes may have had a radius to thickness ratio of 50, the ratio for modern domes can be in excess of 800. The lighter weight of these domes not only permitted far greater spans, but also allowed for the creation of large movable domes over modern sports stadiums. Experimental rammed earth domes were made as part of work on sustainable architecture at

18634-621: The new Kayser-i Rûm , the Ottoman Turkish equivalent of the Caesar of Rome, and the Ottoman state was reorganized into an empire. Following the capture of Constantinople, Mehmed II immediately set out to revitalize the city. Cognizant that revitalization would fail without the repopulation of the city, Mehmed II welcomed everyone–foreigners, criminals, and runaways– showing extraordinary openness and willingness to incorporate outsiders that came to define Ottoman political culture. He also invited people from all over Europe to his capital, creating

18788-511: The nymph Ceroëssa. Modern excavations have raised the possibility that the name Byzantium might reflect the sites of native Thracian settlements that preceded the fully-fledged town. Constantinople comes from the Latin name Constantinus , after Constantine the Great , the Roman emperor who refounded the city in 324 CE. Constantinople remained the most common name for the city in the West until

18942-547: The one in Tarlabaşı ; some of these projects, like the one in Sulukule , have faced criticism. The Turkish government also has ambitious plans for an expansion of the city west and northwards on the European side in conjunction with the new Istanbul Airport , opened in 2019; the new parts of the city will include four different settlements with specified urban functions, housing 1.5 million people. Istanbul does not have

19096-691: The opposite end of the same mosque with interlacing ribs forming five-pointed stars and pentagons. This is considered the landmark Seljuk dome, and may have inspired subsequent patterning and the domes of the Il-Khanate period. The use of tile and of plain or painted plaster to decorate dome interiors, rather than brick, increased under the Seljuks. Beginning in the Ilkhanate , Persian domes achieved their final configuration of structural supports, zone of transition, drum, and shells, and subsequent evolution

19250-581: The place of a prince during royal ceremonies. Over time such domes became primarily focal points for decoration or the direction of prayer. The use of domes in mausoleums can likewise reflect royal patronage or be seen as representing the honor and prestige that domes symbolized, rather than having any specific funerary meaning. The wide variety of dome forms in medieval Islam reflected dynastic, religious, and social differences as much as practical building considerations. Because domes are concave from below, they can reflect sound and create echoes. A dome may have

19404-458: The relatively light and flexible nature of the material and were the normal method for domed churches by the 7th century, although most domes were built with the other less flexible materials. Wooden domes were protected from the weather by roofing, such as copper or lead sheeting. Domes of cut stone were more expensive and never as large, and timber was used for large spans where brick was unavailable. Roman concrete used an aggregate of stone with

19558-417: The ribs at the base of the dome. The central dome of St. Peter's Basilica also uses this method. Cultures from pre-history to modern times constructed domed dwellings using local materials. Although it is not known when the first dome was created, sporadic examples of early domed structures have been discovered. The earliest discovered may be four small dwellings made of Mammoth tusks and bones. The first

19712-471: The rotation of a curve around a vertical axis, hemispherical domes have circular bases and horizontal sections and are a type of "circular dome" for that reason. They experience vertical compression along their meridians, but horizontally experience compression only in the portion above 51.8 degrees from the top. Below this point, hemispherical domes experience tension horizontally, and usually require buttressing to counteract it. According to E. Baldwin Smith, it

19866-402: The round building may be called a " rotunda ". Drums are also called " tholobates " and may or may not contain windows. A " tambour " or " lantern " is the equivalent structure over a dome's oculus, supporting a cupola. When the base of the dome does not match the plan of the supporting walls beneath it (for example, a dome's circular base over a square bay ), techniques are employed to bridge

20020-456: The same time. Baroque and Neoclassical architecture took inspiration from Roman domes. Advancements in mathematics, materials, and production techniques resulted in new dome types. Domes have been constructed over the centuries from mud, snow, stone, wood, brick, concrete, metal, glass, and plastic. The symbolism associated with domes includes mortuary , celestial , and governmental traditions that have likewise altered over time. The domes of

20174-495: The scarcity of wood in many areas of the Iranian plateau and Greater Iran , domes were an important part of vernacular architecture throughout Persian history. The Persian invention of the squinch , a series of concentric arches forming a half-cone over the corner of a room, enabled the transition from the walls of a square chamber to an octagonal base for a dome in a way reliable enough for large constructions and domes moved to

20328-513: The status of caliphate in 1517, with Constantinople remaining the capital of this last caliphate for four centuries. Suleiman the Magnificent 's reign from 1520 to 1566 was a period of especially great artistic and architectural achievement; chief architect Mimar Sinan designed several iconic buildings in the city, while Ottoman arts of ceramics , stained glass , calligraphy , and miniature flourished. The population of Constantinople

20482-465: The structure. Also called domical vaults (a term sometimes also applied to sail vaults), polygonal domes , coved domes , gored domes , segmental domes (a term sometimes also used for saucer domes), paneled vaults , or pavilion vaults , these are domes that maintain a polygonal shape in their horizontal cross section. The component curved surfaces of these vaults are called severies , webs , or cells . The earliest known examples date to

20636-408: The substructure and on the imperial palace. The building was finally restored in 1986 when it was reopened as mosque. In 1990, the cistern was restored too, and it has hosted a shopping mall for a few years. Now the cistern is used by the women to pray. The building, whose masonry consists entirely of bricks , is built on a foundation structure made of alternated courses of bricks and stone, and has

20790-405: The thick and heavy bulging portion serving to buttress against the tendency of masonry domes to spread at their bases. The Taj Mahal is a famous example. An oval dome is a dome of oval shape in plan, profile, or both. The term comes from the Latin ovum , meaning "egg". The earliest oval domes were used by convenience in corbelled stone huts as rounded but geometrically undefined coverings, and

20944-556: The two shells of the dome have significantly different profiles, which spread rapidly throughout the region. The development of taller drums also continued into the Timurid period. The large, bulbous, fluted domes on tall drums that are characteristic of 15th century Timurid architecture were the culmination of the Central Asian and Iranian tradition of tall domes with glazed tile coverings in blue and other colors. The domes of

21098-505: The two. One technique is to use corbelling, progressively projecting horizontal layers from the top of the supporting wall to the base of the dome, such as the corbelled triangles often used in Seljuk and Ottoman architecture. The simplest technique is to use diagonal lintels across the corners of the walls to create an octagonal base. Another is to use arches to span the corners, which can support more weight. A variety of these techniques use what are called " squinches ". A squinch can be

21252-482: The use of domes in architecture and in the ciborium , a domical canopy like the baldachin used as a ritual covering for relics or the church altar . The celestial symbolism of the dome, however, was the preeminent one by the Christian era . In the early centuries of Islam, domes were closely associated with royalty. A dome built in front of the mihrab of a mosque, for example, was at least initially meant to emphasize

21406-404: The waters of Istanbul has dwindled in the recent decades. From around 60 different fish species recorded in the 1970s only 20 of them still survive in the Bosporus. Common bottlenose dolphin (Turkish: afalina ), short-beaked common dolphin (Turkish: tırtak ) and harbor porpoise (Turkish: mutur ) make up the marine mammals presently found in the Bosporus and surrounding waters, though since

21560-608: The wild land mammals Istanbul hosts a sizeable stray animal population. The presence of feral cats in Istanbul ( Turkish : sokak kedisi ) is noted to be very prevalent, with estimates ranging from a hundred thousand to over a million stray cats. The feral cats in the city have gained widespread media and public attention and are considered to be symbols of the city. Rose-ringed parakeet colonies are present in urban areas, similar to other European cities as feral parrots , and considered as invasive species . Air pollution in Turkey

21714-443: Was Rosaceae (16 species). Turkish Straits and Sea of Marmara play a vital role for migrating fish and other marine animals between Mediterranean, Marmara and Black Sea. Bosporus hosts pelagic , demersal and semipelagic fish species and more than 130 different taxa have been documented in the strait. Bluefish , bonito , sea bass , horse mackerel and anchovies compose the economically important species. Fish diversity in

21868-460: Was 570,000 by the end of the 18th century. A period of rebellion at the start of the 19th century led to the rise of the progressive Sultan Mahmud II and eventually to the Tanzimat period, which produced political reforms and allowed new technology to be introduced to the city. Bridges across the Golden Horn were constructed during this period, and Constantinople was connected to the rest of

22022-525: Was a shape likely known to the Assyrians, defined by Greek theoretical mathematicians, and standardized by Roman builders. Bulbous domes bulge out beyond their base diameters, offering a profile greater than a hemisphere. An onion dome is a greater than hemispherical dome with a pointed top in an ogee profile. They are found in the Near East , Middle East , Persia, and India and may not have had

22176-501: Was damaged again by fires in 1784 and 1911, when it was abandoned. In 1930, an excavation led by David Talbot Rice discovered the round cistern. In 1964–1965, a radical restoration led by the Archaeological Museum of Istanbul replaced almost all the external masonry of the edifice, and was then interrupted. In 1965, two parallel excavations led by art historian Cecil L. Striker and by R. Naumann focused respectively on

22330-584: Was found by a farmer in Mezhirich , Ukraine, in 1965 while he was digging in his cellar and archaeologists unearthed three more. They date from 19,280 – 11,700 BC. In modern times , the creation of relatively simple dome-like structures has been documented among various indigenous peoples around the world. The wigwam was made by Native Americans using arched branches or poles covered with grass or hides. The Efé people of central Africa construct similar structures , using leaves as shingles. Another example

22484-470: Was in 1730 during the reign of Sultan Mahmud I . In modern Turkish , the name is written as İstanbul , with a dotted İ, as the Turkish alphabet distinguishes between a dotted and dotless I . In English, the stress is on the first or last syllable, but in Turkish it is on the second syllable. A person from the city is an İstanbullu (plural İstanbullular ); Istanbulite is used in English. Neolithic artifacts, uncovered by archeologists at

22638-522: Was known, in practice, domes of this shape were created by combining segments of circles. Popular in the 16th and 17th centuries, oval and elliptical plan domes can vary their dimensions in three axes or two axes. A sub-type with the long axis having a semicircular section is called a Murcia dome, as in the Chapel of the Junterones at Murcia Cathedral . When the short axis has a semicircular section, it

22792-500: Was later owned by Khedive Isma'il Pasha of Ottoman Egypt in the 19th century. Emirgan Park is known for its diversity of plants and an annual tulip festival is held there since 2005. The AKP government's decision to replace Taksim Gezi Park with a replica of the Ottoman era Taksim Military Barracks (which was transformed into the Taksim Stadium in 1921, before being demolished in 1940 for building Gezi Park) sparked

22946-403: Was later permanently divided between the two sons of Theodosius I upon his death on 17 January 395, when the city became the capital of the empire; during the following millennium of Roman history the state is commonly referred to as the "Byzantine Empire". The establishment of Constantinople was one of Constantine's most lasting accomplishments, shifting Roman power eastward as the city became

23100-456: Was named after Mehmed II ( Turkish : Fatih Sultan Mehmed ), corresponds to what was the whole of Constantinople until the Ottoman conquest; today it is the capital district and called the historic peninsula of Istanbul on the southern shore of the Golden Horn , across the medieval Genoese citadel of Galata on the northern shore. The Genoese fortifications in Galata were largely demolished in

23254-488: Was reopened 30 years later on 23 July 1908, which marked the beginning of the Second Constitutional Era . The civil strife and political uncertainties in the Ottoman Empire during the months after the revolution encouraged Austria-Hungary to annex Bosnia and Bulgaria to declare its independence in a jointly coordinated move on 5 October 1908. Sultan Abdul Hamid II was deposed in 1909, following

23408-413: Was replaced by a wooden portico. The building has three polygonal apses . The central one belongs to the sanctuary ( bema ), while the lateral are parts of two clover-shaped side chapels ( pastophoria ), prothesis and diakonikon . The Ottomans built a stone minaret close to the narthex. The building was originally decorated with a marble revetment and mosaics , which disappeared totally. As

23562-405: Was restricted to variations in form and shell geometry. Characteristic of these domes are the use of high drums and several types of discontinuous double-shells, and the development of triple-shells and internal stiffeners occurred at this time. The construction of tomb towers decreased. The 7.5 meter wide double dome of Soltan Bakht Agha Mausoleum (1351–1352) is the earliest known example in which

23716-460: Was ultimately defeated. The deportation of Armenian intellectuals on 24 April 1915 was among the major events which marked the start of the Armenian genocide during WWI. Due to Ottoman and Turkish policies of Turkification and ethnic cleansing , the city's Christian population declined from 450,000 to 240,000 between 1914 and 1927. The Armistice of Mudros was signed on 30 October 1918 and

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