Pammakaristos Church, also known as the Church of Theotokos Pammakaristos (Greek: Θεοτόκος ἡ Παμμακάριστος, "All-Blessed Mother of God"), in 1591 converted into a mosque and known as Fethiye Mosque (Turkish: Fethiye Camii, "mosque of the conquest") and today partly a museum, is one of the most famous Byzantine churches in Istanbul, Turkey. The parekklesion, besides being one of the most important examples of Constantinople's Palaiologan architecture, and the last pre-Ottoman building to house the Ecumenical Patriarchate, also has the largest amount of Byzantine mosaics in Istanbul after the Hagia Sophia and Chora Church.