The Pammakaristos Church, also known as the Church of Theotokos Pammakaristos, is one of the most famous Byzantine church buildings in Istanbul, Turkey, and was the last pre-Ottoman building to house the Ecumenical Patriarchate. Converted in 1591 into the Fethiye Mosque, it is today partly a museum housed in a side chapel or parekklesion. One of the most important examples of Constantinople's Palaiologan architecture, the church contains the largest quantity of Byzantine mosaics in Istanbul after the Hagia Sophia and The Chora.

The Chora or Kariye Mosque is a medieval Greek Orthodox church building, mostly used as a mosque since the 16th century, in the Edirnekapı neighborhood of Fatih district, Istanbul, Turkey. It is mainly famous for its outstanding Late Byzantine mosaics and frescos.