Atik Mustafa Pasha Mosque (Turkish: Atik Mustafa Paşa Camii; also named Hazreti Cabir Camii) is a former Eastern Orthodox church in Istanbul, converted into a mosque by the Ottomans. The dedication of the church is obscure. For a long time it has been identified with the church of Saints Peter and Mark, but without any proof. Now it seems more probable that the church is to be identified with Saint Thekla of the Palace of Blachernae (Greek: Άγία Θέκλα τοῦ Παλατίου τῶν Βλαχερνών, Hagia Thekla tou Palatiou tōn Vlakhernōn). The building belongs stylistically to the eleventh-twelfth century.
The building lies in the district of Fatih, in the neighborhood of Ayvansaray, in Çember Sokak. It lies a few hundred metres inside the walled city, at a short distance from the shore of the Golden Horn, at the foot of the sixth hill of Constantinople.
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