Little Hagia Sophia
 Little Hagia Sophia (Turkish: Küçük Ayasofya Camii) formerly the Church of the Saints Sergius and Bacchus (Greek: Eκκλησία τῶν Άγίων Σεργίου καί Βάκχου ὲν τοῖς Ὸρμίσδου) is a former Eastern Orthodox church dedicated to Saints Sergius and Bacchus in Constantinople converted into a mosque during the Ottoman Empire.This Byzantine building with a central dome plan was erected in the sixth century by Justinian likely was a model for Hagia Sophia (St.