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LITTLE HAGIA SOPHIA MOSQUE

Little Hagia Sophia was ordered by the Byzantine emperor Justin I and his wife Theodora as the Church of the Saints Sergius and Bacchus and converted to a mosque in 1500’s during the reign of Sultan Bayezid I by Hüseyin Ağa, the Chief Black Eunuch, custodian of the Bab-ı-Saadet (literally The Gate of Felicity in Ottoman Turkish) in the Sultan's residence, the Topkapı Palace. It is the oldest Byzantine building in Istanbul.