Eski Imaret Mosque (Turkish: "Eski Imaret Camii" ) is a former Eastern Orthodox church converted into a mosque by the Ottomans. The church has traditionally been identified with that belonging to the Monastery of Christ Pantepoptes (Greek: Μονή του Χριστού Παντεπόπτη ), meaning "Christ the all-seeing". It is the only documented 11th-century church in Istanbul which survives intact, and represents a key monument of middle Byzantine architecture