The Omphalion, a marble section of the floor in Hagia Sophia, is the place where Byzantine emperors have been crowned. The stone floor of the Hagia Sophia dates from the 6th century. (Source)
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The geometric conception is based on mathematical formulas of Heron of Alexandria. It avoids use of irrational numbers for the construction (Source)
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a) Plan of the gallery (upper half)b) Plan of the ground floor (lower half) (Source)
Originally a church, later a mosque, the 6th-century Hagia Sophia (532537) by Byzantine emperor Justinian the Great was the largest cathedral in the world for nearly a thousand years, until the completion of the Seville Cathedral (1507) in Spain. (Source)
The mihrab located in the apse where the altar used to stand, pointing towards Mecca. The two giant candlesticks flanking the mihrab were brought in from Ottoman Hungary by Sultan Suleiman the Magnificent. (Source)
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Drawing of the colossal bronze imperial statue from atop the Column of Justinian (15th century). (Source)
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The hexapterygon (six-winged angel) on the north-east pendentive (upper left), whose face was discovered and then covered back by the Fossati brothers after restoration works in the 19th century. It was uncovered again in 2009 (annotations). (Source)
Polychrome marble revetment on the wall of the gallery (Source)
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Basket capitals and verd antique and marble columns. The basket capitals of the building are carved with monograms of the names Justinian (Greek: , romanized:Ioustinians) and Thedora (, Theodra) and their imperial titles ", basiles" and ", augosta".[59] (Source)
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Construction of church depicted in codex Manasses Chronicle (14th century) (Source)
RHS Georgios Averof enters the Golden Horn in 1919, during the Allied occupation of Constantinople, with Hagia Sophia visible in the background (Lycourgos Kogevinas[el], National Historical Museum, Athens) (Source)