Church of Saint Mary of the Mongols

Saint Mary of the Mongols or Παναγία Μουχλιώτισσα ; Turkish name: Kanlı Kilise , is an Eastern Orthodox church in Istanbul. It is the only remaining Byzantine church of Constantinople that has never been converted to a mosque, always remaining open to the Greek Orthodox Church.

The church, which usually is not open to the public and lies behind a high wall, is located in the neighborhood of Fener, Fatih district. It lies on Tevkii Cafer Mektebi Sokak, at the summit of a slope overlooking the Golden Horn, and near to the imposing building of the Phanar Greek Orthodox College.

Wikipedia