The Church of the Holy Apostles (, "Agioi Apostoloi"; ), also known as the "Imperial Polyándreion" (imperial cemetery), was a Greek Eastern Orthodox church in Constantinople, capital of the Eastern Roman Empire. The first structure dates to the 4th century, though future emperors would add to and improve upon it. It was second in size and importance only to the Hagia Sophia among the great churches of the capital. When Constantinople fell to the Ottomans in 1453, the Holy Apostles briefly became the seat of the Ecumenical Patriarch of the Greek Orthodox Church. Three years later the edifice, which was in a dilapidated state, was abandoned by the Patriarch, and the patriarchate was moved to the Pammakaristos Church. In 1461, the church of the Holy Apostles was demolished by the Ottomans to make way for the Fatih Mosque.