Eastern Catholic Churches - "Those Christian Churches whose members follow the Eastern rite and are in communion with Rome." "The Eastern Catholic Churches, like their Orthodox counterparts, trace their origins to the four great patriarchates in the East: Alexandria, Antioch, Jerusalem, and Constantinople. The fifth, and supreme, patriarchate was, of course, Rome, in the West." Bunson, Matt (1995). Our Sunday Visitor's Encyclopedia of Catholic History. Huntington, IN: Our Sunday Visitor
Code of Canons of the Eastern Churches by 
