Gül Mosque
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Gül Mosque (, meaning Rose Mosque' in English) is a former
Byzantine The Byzantine Empire, also known as the Eastern Roman Empire, was the continuation of the Roman Empire centred on Constantinople during late antiquity and the Middle Ages. Having survived the events that caused the fall of the Western Roman E ...
church Church may refer to: Religion * Church (building), a place/building for Christian religious activities and praying * Church (congregation), a local congregation of a Christian denomination * Church service, a formalized period of Christian comm ...
in
Istanbul Istanbul is the List of largest cities and towns in Turkey, largest city in Turkey, constituting the country's economic, cultural, and historical heart. With Demographics of Istanbul, a population over , it is home to 18% of the Demographics ...
,
Turkey Turkey, officially the Republic of Türkiye, is a country mainly located in Anatolia in West Asia, with a relatively small part called East Thrace in Southeast Europe. It borders the Black Sea to the north; Georgia (country), Georgia, Armen ...
, converted into a
mosque A mosque ( ), also called a masjid ( ), is a place of worship for Muslims. The term usually refers to a covered building, but can be any place where Salah, Islamic prayers are performed; such as an outdoor courtyard. Originally, mosques were si ...
by the
Ottomans Ottoman may refer to: * Osman I, historically known in English as "Ottoman I", founder of the Ottoman Empire * Osman II, historically known in English as "Ottoman II" * Ottoman Empire The Ottoman Empire (), also called the Turkish Empir ...
. It is in Vakıf Mektebi Sokak in the district of
Fatih Fatih () is a municipality and district of Istanbul Province, Turkey. Its area is 15 km2, and its population is 368,227 (2022). It is home to almost all of the provincial authorities (including the mayor's office, police headquarters, metro ...
,
Istanbul Istanbul is the List of largest cities and towns in Turkey, largest city in Turkey, constituting the country's economic, cultural, and historical heart. With Demographics of Istanbul, a population over , it is home to 18% of the Demographics ...
, in the neighbourhood of
Ayakapı Ayakapı ()Janin (1964) (the toponym comes from the Turkish word ''Aya'', derived from pronunciation of the Greek word ἁγἰα, meaning "female Saint" and the Turkish word ''kapı'', meaning "gate") is a quarter of Istanbul, Turkey. It is part o ...
(' Gate of the Saint'). It lies at the end of the valley which divides the fourth and fifth hills of Constantinople and overlooks the
Golden Horn The Golden Horn ( or ) is a major urban waterway and the primary inlet of the Bosphorus in Istanbul, Turkey. As a natural estuary that connects with the Bosphorus Strait at the point where the strait meets the Sea of Marmara, the waters of the ...
from its imposing position .


Problem of identification

Although the Gül Mosque was one of the most important
Byzantine The Byzantine Empire, also known as the Eastern Roman Empire, was the continuation of the Roman Empire centred on Constantinople during late antiquity and the Middle Ages. Having survived the events that caused the fall of the Western Roman E ...
buildings in
Constantinople Constantinople (#Names of Constantinople, see other names) was a historical city located on the Bosporus that served as the capital of the Roman Empire, Roman, Byzantine Empire, Byzantine, Latin Empire, Latin, and Ottoman Empire, Ottoman empire ...
, its dedication and the date of its construction have been disputed by scholars. It is sometimes identified with the church belonging to the nunnery of Saint Theodosia (
Greek Greek may refer to: Anything of, from, or related to Greece, a country in Southern Europe: *Greeks, an ethnic group *Greek language, a branch of the Indo-European language family **Proto-Greek language, the assumed last common ancestor of all kno ...
: Μονή τής Άγιας Θεοδοσίας εν τοις Δεξιοκράτους, ''Monē tis Hagias Theodosias en tois Dexiokratous'') or with that of the monastery of Christ the Benefactor (
Greek Greek may refer to: Anything of, from, or related to Greece, a country in Southern Europe: *Greeks, an ethnic group *Greek language, a branch of the Indo-European language family **Proto-Greek language, the assumed last common ancestor of all kno ...
: Μονή του Χριστού του Ευεργέτου, ''Monē tou Christou tou Euergetou'').Müller-Wiener (1977), p. 140. After Stephan Gerlach visited it in the late 15th century, the building was always identified as the church of ''Hagia Theodosia en tois Dexiokratous''. However, at the beginning of the last century, Jules Pargoire identified it instead as the church of ''Hagia Euphēmia en tō Petriō'', built during the reign of
Basil I Basil I, nicknamed "the Macedonian" (; 811 – 29 August 886), was List of Byzantine emperors, Byzantine emperor from 867 to 886. Born to a peasant family in Macedonia (theme), Macedonia, he rose to prominence in the imperial court after gainin ...
(867–886), and explained why he thought this was the case. After studies aimed at the dating of the basement in the 1960s, the German archaeologist Hartmut Schäfer estimated the date of the church's construction as between the end of the eleventh and the first half of the 12th century, placing it in the
Komnenian period The Byzantine Empire was ruled by emperors of the Komnenos dynasty for a period of 104 years, from 1081 to about 1185. The ''Komnenian'' (also spelled ''Comnenian'') period comprises the reigns of five emperors, Alexios I, John II, Manuel I, ...
, and identifying it hypothetically as the church of the monastery of ''Christos Euergetēs''.Schäfer (1973), p. 84 He refuted the idea that the Gül Mosque was the building where the body of Hagia Theodosia was brought at the end of the
Iconoclasm Iconoclasm ()From . ''Iconoclasm'' may also be considered as a back-formation from ''iconoclast'' (Greek: εἰκοκλάστης). The corresponding Greek word for iconoclasm is εἰκονοκλασία, ''eikonoklasia''. is the social belie ...
period.Schäfer (1973), p. 83. On the other hand, he did not exclude the possibility that the building could have been dedicated to Hagia Theodosia at a later period.Schäfer (1973), p. 89.


History


Byzantine period

On January 19, 729, at the very beginning of the
iconoclastic Iconoclasm ()From . ''Iconoclasm'' may also be considered as a back-formation from ''iconoclast'' (Greek: εἰκοκλάστης). The corresponding Greek word for iconoclasm is εἰκονοκλασία, ''eikonoklasia''. is the social belie ...
persecutions,
Emperor The word ''emperor'' (from , via ) can mean the male ruler of an empire. ''Empress'', the female equivalent, may indicate an emperor's wife (empress consort), mother/grandmother (empress dowager/grand empress dowager), or a woman who rules ...
Leo III the Isaurian Leo III the Isaurian (; 685 – 18 June 741), also known as the Syrian, was the first List of Byzantine emperors, Byzantine emperor of the Isaurian dynasty from 717 until his death in 741. He put an end to the Twenty Years' Anarchy, a period o ...
ordered the removal of an image of
Christ Jesus ( AD 30 or 33), also referred to as Jesus Christ, Jesus of Nazareth, and many other names and titles, was a 1st-century Jewish preacher and religious leader. He is the Jesus in Christianity, central figure of Christianity, the M ...
which stood over the '' Chalkē'', the main gate of the
Great Palace of Constantinople The Great Palace of Constantinople (, ''Méga Palátion''; ), also known as the Sacred Palace (, ''Hieròn Palátion''; ), was the large imperial Byzantine palace complex located in the south-eastern end of the peninsula today making up the Fati ...
.Mamboury (1953), p. 299.Schäfer (1973), p. 82. While an officer was executing the order, a group of women gathered to prevent the operation, and one of them, a
nun A nun is a woman who vows to dedicate her life to religious service and contemplation, typically living under vows of poverty, chastity, and obedience in the enclosure of a monastery or convent.''The Oxford English Dictionary'', vol. X, page 5 ...
named Theodosia, caused him to fall from the ladder. The man died, and Theodosia was captured and executed. After the end of the Iconoclasm era, Theodosia was recognized as a
martyr A martyr (, ''mártys'', 'witness' Word stem, stem , ''martyr-'') is someone who suffers persecution and death for advocating, renouncing, or refusing to renounce or advocate, a religious belief or other cause as demanded by an external party. In ...
and
saint In Christianity, Christian belief, a saint is a person who is recognized as having an exceptional degree of sanctification in Christianity, holiness, imitation of God, likeness, or closeness to God in Christianity, God. However, the use of the ...
, and her body was kept and venerated in the church of ''Hagia Euphemia en tō Petriō'', in the quarter named ''Dexiokratiana'', after the houses owned here by one Dexiokrates.Janin (1953), p. 151 The church and adjoining monastery were erected by Emperor
Basil I Basil I, nicknamed "the Macedonian" (; 811 – 29 August 886), was List of Byzantine emperors, Byzantine emperor from 867 to 886. Born to a peasant family in Macedonia (theme), Macedonia, he rose to prominence in the imperial court after gainin ...
at the end of the ninth century. The monastery hosted his four daughters, who were all buried in the church. Hagia Euphemia lay near the ''Monastery of
Christ Jesus ( AD 30 or 33), also referred to as Jesus Christ, Jesus of Nazareth, and many other names and titles, was a 1st-century Jewish preacher and religious leader. He is the Jesus in Christianity, central figure of Christianity, the M ...
os Euergetēs'', whose foundation date is unknown although it was restored by ''
protosebastos The title of ''protosebastos'' (, ''prōtosébastos'', "first '' sebastos''") was a high Byzantine court title created by Emperor Alexios I Komnenos. History Although the title first appears in a document of 1049, where Domenico I Contarini, the ...
'' John Komnenos, son of
Andronikos I Komnenos Andronikos I Komnenos (;  – 12 September 1185), Latinized as Andronicus I Comnenus, was Byzantine emperor from 1183 to 1185. A nephew of John II Komnenos (1118–1143), Andronikos rose to fame in the reign of his cousin Manuel I Komne ...
and brother of co-emperor John, who died fighting in the
battle of Myriokephalon The Battle of Myriokephalon (also known as the Battle of Myriocephalum, , or ''Düzbel Muharebesi'') was a battle between the Byzantine Empire and the Seljuk Turks in the mountains west of Iconium (Konya) in southwestern Turkey on 17 September ...
in 1176. On April 12, 1204, during the
Fourth Crusade The Fourth Crusade (1202–1204) was a Latin Christian armed expedition called by Pope Innocent III. The stated intent of the expedition was to recapture the Muslim-controlled city of Jerusalem, by first defeating the powerful Egyptian Ayyubid S ...
, the Latin fleet gathered in front of the monastery of Christos Euergetes before attacking the city. During the period of the
Latin occupation The Frankish Occupation (; anglicized as ), also known as the Latin Occupation () and, for the Venetian domains, Venetian Occupation (), was the period in Greek history after the Fourth Crusade (1204), when a number of primarily French ...
, the navy had its anchorage in front of the monastery. Many sacred
relics In religion, a relic is an object or article of religious significance from the past. It usually consists of the physical remains or personal effects of a saint or other person preserved for the purpose of veneration as a tangible memorial. Reli ...
kept in the church were looted by the
Crusaders The Crusades were a series of religious wars initiated, supported, and at times directed by the Papacy during the Middle Ages. The most prominent of these were the campaigns to the Holy Land aimed at reclaiming Jerusalem and its surrounding ...
and some still exist in churches throughout western Europe. Over time, the veneration of St Theodosia grew until, after the 11th century, the church was renamed after her. Since the original
feast day The calendar of saints is the traditional Christian method of organizing a liturgical year by associating each day with one or more saints and referring to the day as the feast day or feast of said saint. The word "feast" in this context does n ...
of Hagia Euphemia was on 30 May, and that of another Hagia Theodosia (Hagia Theodosia of Tyros) was on 29 May, 29 May came to be accepted as the feast day of ''Hagia Theodosia hē Konstantinoupolitissa'' ('Saint Theodosia of Constantinople'). Hagia Theodosia became one of the most venerated saints in Constantinople, being invoked particularly by the infirm. Her fame increased when a deaf-mute was miraculously cured in 1306. The church was often mentioned by the
Russia Russia, or the Russian Federation, is a country spanning Eastern Europe and North Asia. It is the list of countries and dependencies by area, largest country in the world, and extends across Time in Russia, eleven time zones, sharing Borders ...
n pilgrims who visited the city in the fourteenth and early fifteenth century, although it was sometimes confused with the nearby church of Christ Euergetēs. Twice a week there was a
procession A procession is an organized body of people walking in a formal or ceremonial manner. History Processions have in all peoples and at all times been a natural form of public celebration, as forming an orderly and impressive ceremony. Religious ...
during which the relics hosted in the church were carried and a crowd of sick people followed, praying to be cured. The church was mentioned for the last time on May 28, 1453. On that day, which was the eve both of the saint's feast and also of the end of the Byzantine Empire, the Emperor
Constantine XI Constantine XI Dragases Palaiologos or Dragaš Palaeologus (; 8 February 140429 May 1453) was the last reigning Byzantine emperor from 23 January 1449 until his death in battle at the fall of Constantinople on 29 May 1453. Constantine's death ...
went with the
Patriarch The highest-ranking bishops in Eastern Orthodoxy, Oriental Orthodoxy, the Roman Catholic Church (above major archbishop and primate), the Hussite Church, Church of the East, and some Independent Catholic Churches are termed patriarchs (and ...
to pray in the church, which was adorned with garlands of roses. Afterward Constantine left for the last fight before the city fell to the Ottomans . Many people remained all the night in the church, praying for the city's salvation. After entering the city, the Ottoman troops arrived to find the building still adorned with flowers, hence, it is thought to have been called "Rose Mosque". After the Ottoman conquest, the basement of the church fell into ruin and was used as naval dockyard. Close to the building, Seyhülislam Molla Hüsrev Mehmet Effendi (died 1480) established a ''
vakıf A (; , plural ), also called a (, plural or ), or '' mortmain'' property, is an inalienable charitable endowment under Islamic law. It typically involves donating a building, plot of land or other assets for Muslim religious or chari ...
'' (foundation) and erected a small mosque (''Küçük Mustafa Paşa Mescidi'') and a
bath Bath may refer to: * Bathing, immersion in a fluid ** Bathtub, a large open container for water, in which a person may wash their body ** Public bathing, a public place where people bathe * Thermae, ancient Roman public bathing facilities Plac ...
(''Küçük Mustafa Paşa Hamamı''), which still exists.Müller-Wiener (1977), p. 142. In 1490, the ruined church was repaired and converted into a mosque. During the reign of
Selim II Selim II (; ; 28 May 1524 – 15 December 1574), also known as Selim the Blond () or Selim the Drunkard (), was the sultan of the Ottoman Empire from 1566 until his death in 1574. He was a son of Suleiman the Magnificent and his wife Hurrem Sul ...
, between 1566 and 1574, a
minaret A minaret is a type of tower typically built into or adjacent to mosques. Minarets are generally used to project the Muslim call to prayer (''adhan'') from a muezzin, but they also served as landmarks and symbols of Islam's presence. They can h ...
was erected by Hassam
Pasha Pasha (; ; ) was a high rank in the Ottoman Empire, Ottoman political and military system, typically granted to governors, generals, dignitary, dignitaries, and others. ''Pasha'' was also one of the highest titles in the 20th-century Kingdom of ...
, a supplier to the
Ottoman navy The Ottoman Navy () or the Imperial Navy (), also known as the Ottoman Fleet, was the naval warfare arm of the Ottoman Empire. It was established after the Ottomans first reached the sea in 1323 by capturing Praenetos (later called Karamürsel ...
. Afterwards the mosque was often named after him. Between 1573 and 1578, during his sojourn in Istanbul, the German preacher Stephan Gerlach visited the mosque and identified it with the church of Hagia Theodosia. During that century a local holy man named Gül Baba was allegedly buried in the building. It is possible that the mosque was actually named after him. During the 17th and 18th centuries, the upper part of the church-mosque was badly damaged by earthquakes. Eventually Sultan
Murad IV Murad IV (, ''Murād-ı Rābiʿ''; , 27 July 1612 – 8  February 1640) was the sultan of the Ottoman Empire from 1623 to 1640, known both for restoring the authority of the state and for the brutality of his methods. Murad I ...
restored it, rebuilding the dome and its pendentives, almost the whole west side, the vaults at the southwest and northwest corners, and the minaret.Müller-Wiener (1977), p. 143. The building escaped the fire which ravaged the quarter in 1782, and was restored again by Sultan
Mahmud II Mahmud II (, ; 20 July 1785 – 1 July 1839) was the sultan of the Ottoman Empire from 1808 until his death in 1839. Often described as the "Peter the Great of Turkey", Mahmud instituted extensive administrative, military, and fiscal reforms ...
(1808–1839), who added the wooden Sultan's lodge.


Architecture


Exterior

The exterior of the building is quite imposing. It stands on a high
vaulted In architecture, a vault (French ''voûte'', from Italian ''volta'') is a self-supporting arched form, usually of stone or brick, serving to cover a space with a ceiling or roof. As in building an arch, a temporary support is needed while ring ...
basement, which was used during the Byzantine period for secular purposes. The
masonry Masonry is the craft of building a structure with brick, stone, or similar material, including mortar plastering which are often laid in, bound, and pasted together by mortar (masonry), mortar. The term ''masonry'' can also refer to the buildin ...
of the basement has been built using the technique of the "recessed brick", typical of the Byzantine architecture of the middle period. In this technique, alternate courses of bricks are mounted behind the line of the wall, and are plunged in a
mortar Mortar may refer to: * Mortar (weapon), an indirect-fire infantry weapon * Mortar (masonry), a material used to fill the gaps between blocks and bind them together * Mortar and pestle, a tool pair used to crush or grind * Mortar, Bihar, a village i ...
bed which means that the thickness of the mortar layers is about three times greater than that of the brick layers.Another example of edifices of Constantinople where this technique was used is the mosque of Eski Imaret. Krautheimer (1986), p. 400. The building has a
Greek cross The Christian cross, with or without a figure of Jesus, Christ included, is the main religious symbol of Christianity. A cross with a figure of Christ affixed to it is termed a crucifix and the figure is often referred to as the ''corpus'' (La ...
plan, which is oriented northwest-southeast. It is long and wide, and is surmounted by five
dome A dome () is an architectural element similar to the hollow upper half of a sphere. There 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 m ...
s, one above the central nave and four smaller ones placed at the four corners.Van Millingen (1912), p. 172. The central dome, which has a low external drum and no windows, is Ottoman, as are the broad pointed arches which carry it. The original dome, like that of the
Kalenderhane Mosque Kalenderhane Mosque () is a former Eastern Orthodox Church, Eastern Orthodox church (building), church in Istanbul, Turkey, converted into a mosque by the Ottoman Empire, Ottomans. With high probability the church was originally dedicated to the ...
, should have been carried by a tall drum pierced by windows.Schäfer (1973), p. 86. On the southeastern façade, the central apse, with seven sides, and the lateral apses, with three sides, project boldly outwards. The central apse appears to be a later Byzantine reconstruction, since it lacks the four tiers of five
niche Niche may refer to: Science *Developmental niche, a concept for understanding the cultural context of child development and growth *Ecological niche, a term describing the relational position of an organism's species *Niche differentiation, in ec ...
s, which feature ornamental
brickwork Brickwork is masonry produced by a bricklayer, using bricks and mortar. Typically, rows of bricks called '' courses'' are laid on top of one another to build up a structure such as a brick wall. Bricks may be differentiated from blocks by ...
and adorn the lateral ones. Above the niches runs a cornice. The side apses resemble those of the Pantokrator Church and support a late dating for the building.


Interior

The entrance to the mosque is through a wooden
porch A porch (; , ) is a room or gallery located in front of an entrance to a building. A porch is placed in front of the façade of a building it commands, and forms a low front. Alternatively, it may be a vestibule (architecture), vestibule (a s ...
, which leads to a low
narthex The narthex is an architectural element typical of Early Christian art and architecture, early Christian and Byzantine architecture, Byzantine basilicas and Church architecture, churches consisting of the entrance or Vestibule (architecture), ve ...
surmounted by a
barrel vault A barrel vault, also known as a tunnel vault, wagon vault or wagonhead vault, is an architectural element formed by the extrusion of a single curve (or pair of curves, in the case of a pointed barrel vault) along a given distance. The curves are ...
. From there a triple arcade leads into the lofty nave, which is flanked by galleries forming the side arms of the cross. They rest on a triple arcade supported by square piers. The nave ends with the main
apse In architecture, an apse (: apses; from Latin , 'arch, vault'; from Ancient Greek , , 'arch'; sometimes written apsis; : apsides) is a semicircular recess covered with a hemispherical Vault (architecture), vault or semi-dome, also known as an ' ...
, which is flanked by two smaller ones. The south-east orientation of the main apse allowed the erection of the
mihrab ''Mihrab'' (, ', pl. ') is a niche in the wall of a mosque that indicates the ''qibla'', the direction of the Kaaba in Mecca towards which Muslims should face when praying. The wall in which a ''mihrab'' appears is thus the "''qibla'' wall". ...
inside it. Each gallery ends with a small chapel, which lie above the prothesis and
diaconicon The diaconicon (; Slavonic: ''diakonik'') is, in Eastern Orthodox and Eastern Catholic Churches, the name given to a chamber on the south side of the central apse of the church, where the vestments, books, etc., that are used in the Divine Servi ...
respectively. Both chapels are surmounted by hemispherical domes built directly above the
pendentive In architecture, a pendentive is a constructional device permitting the placing of a circular dome over a square room or of an elliptical dome over a rectangular room. The pendentives, which are triangular segments of a sphere, taper to point ...
s. Light enters the building through five rows of windows, three belonging to the galleries. Some of the windows are Ottoman. Carved inside each of the two eastern dome piers there is a small chamber. The south east chamber contains the alleged tomb of the Ottoman holy man Gül Baba. Above the entrance an inscription in
Ottoman Turkish Ottoman Turkish (, ; ) was the standardized register of the Turkish language in the Ottoman Empire (14th to 20th centuries CE). It borrowed extensively, in all aspects, from Arabic and Persian. It was written in the Ottoman Turkish alphabet. ...
reads: "Tomb of the
Apostle An apostle (), in its literal sense, is an emissary. The word is derived from Ancient Greek ἀπόστολος (''apóstolos''), literally "one who is sent off", itself derived from the verb ἀποστέλλειν (''apostéllein''), "to se ...
, disciple of Jesus. Peace be with him", which bears witness to the religious
syncretism Syncretism () is the practice of combining different beliefs and various school of thought, schools of thought. Syncretism involves the merging or religious assimilation, assimilation of several originally discrete traditions, especially in the ...
of sixteenth-century Istanbul.Van Millingen (1912), p. 170. The chamber may originally have housed the tomb of St Theodosia. A tradition that one of the piers hides the burial place of the last Byzantine Emperor only dates back to the nineteenth century, and is groundless. The walls of the building were plastered and decorated in the 18th century. Together with the Eski Imaret and
Vefa Kilise Mosque Church-Mosque of Vefa (, meaning "the church mosque of Vefa", to distinguish it from the other ''kilise camiler'' of Istanbul: also known as ''Molla Gürani Camii'' after the name of his founder) is a former Eastern Orthodox church converted into ...
s, the Gül Mosque is one of the most important
cross-in-square A cross-in-square or crossed-dome floor plan was the dominant form of church architecture in the middle and late Byzantine Empire. It featured a square centre with an internal structure shaped like a cross, topped by a dome. Architecture Archite ...
churches in
Istanbul Istanbul is the List of largest cities and towns in Turkey, largest city in Turkey, constituting the country's economic, cultural, and historical heart. With Demographics of Istanbul, a population over , it is home to 18% of the Demographics ...
.Schäfer (1973), pp. 67–69. File:Hagia Theodosia Church (Gül Mosque) Ayakapı, İstanbul (14050358797).jpg, Gül Mosque in the Ottoman period File:GülMosque20071011 04.jpg, Gül Mosque viewed from the south, with its minaret at left File:Rose Mosque 8608.jpg, Gül Mosque interior File:Rose Mosque 8609.jpg, Gül Mosque interior File:Rose Mosque 8613.jpg, Dome of Gül Mosque File:Rose Mosque 8620.jpg, Gül Mosque interior File:Rose Mosque 8627.jpg, Gül Mosque gallery File:Rose Mosque R 6174.jpg, Gül Mosque north wall of interior File:Rose Mosque 8703.jpg, Side view of the Gül Mosque


See also

*
History of Roman and Byzantine domes Domes were a characteristic element of the architecture of Ancient Rome and of its medieval continuation, the Byzantine Empire. They had widespread influence on contemporary and later styles, from Russian and Ottoman architecture to the Italian ...


References


Sources

* * * * * * *


External links


Byzantium 1200 - Gül Mosque

Archnet

Gül Mosque Documentary

Series of 50 pictures of the mosque
{{DEFAULTSORT:Gul Mosque 12th-century mosques in Europe Buildings and structures completed in 1490 Mosques completed in the 1490s Mosques converted from Byzantine churches Fatih Golden Horn Mosque buildings with minarets in Turkey Byzantine church buildings in Istanbul