A former Eastern Orthodox church converted into a mosque by the Ottomans. Neither archeological excavations nor medieval sources have made it possible to find a satisfactory answer as to its original dedication as a church. It is however possible that the small building was part of the Byzantine monastery dedicated to the Holy Martyrs Menodora, Metrodora, and Nymphodora (Greek: Μονῆ τῶν Άγίων Μηνοδώρας, Μητροδώρας καὶ Νυμφοδώρας), or an annex of the nunnery of Kyra Martha (Greek: Μονῆ τἠς Κυράς Μάρθας). The edifice is a minor example of Byzantine architecture in Constantinople, and is important for historical reasons. Its courtyard one the west side looks quite plain, but the outside walls look very old.