They remained in communion with the Ecumenical Patriarchate of Constantinople. Ecumenical Patriarchate of Constantinople (, "Roman Orthodox Patriarchate"). It is also a titular metropolis of the Ecumenical Patriarchate of Constantinople. Under Ottoman rule, the Greek Church was a part of the Ecumenical Patriarchate of Constantinople. The basilica is under the Maronite Catholic Patriarchate. Istanbul, since 1461, is the seat of the Armenian Patriarchate of Constantinople. It is also a titular metropolitan see of the Ecumenical Patriarchate of Constantinople. It is now under the spiritual jurisdiction of the Ecumenical Patriarchate of Constantinople. This is an autonomous jurisdiction affiliated with the Patriarchate of Constantinople. The Ecumenical Patriarchate of Constantinople is still in a difficult position. This diocese would later develop into the Patriarchate of Constantinople. He revived the ecumenical patriarchate and other fundamental Byzantine institutions. There have been 84 individual Patriarchs since establishment of the Patriarchate. The main Basilica of the Nativity is maintained by the Greek Orthodox Patriarchate of Jerusalem. Poros was mentioned in a 1270 document of the Patriarchate of Constantinople.