Holy See of the East of Rome also claims the title of the Catholicos and the Holy Apostolic See of St. Thomas. Patriarch Mar Addai II, is the Catholicos of the Ancient Church of the East. The current Seat of the Catholicos of Ancient Church of the East is in Baghdad, Iraq. The official title of the Head & Father of the Syro-Malabar Catholic Church is "the successor to the Holy Apostolic See of St. Thomas and the Gate of All India". The church is headed by the Major Archbishop of Ernakulam-Angamaly, Cardinal Maran Mar George Alencherry. The current Seat of the Major Archiepiscopal Curia
Mother See of Holy Etchmiadzin Mother See of Holy Etchmiadzin Mother See of Holy Etchmiadzin (, "Mayr At'oř Surb Ēĵmiatsin"), is the governing body of the Armenian Apostolic Church. It is headquartered around Etchmiadzin Cathedral in Vagharshapat (Etchmiadzin), Armenia and is the seat of the Catholicos of All Armenians, the head of the church. The organizational structure of the Mother See of Holy Etchmiadzin is composed of spiritual and administrative bodies representing the authority of the Armenian Church, as follows: The Supreme Spiritual Council ( "Geraguyn Hokevor Khorhurt") is headed by the Catholicos of All Armenians. It is the highest executive body of the Armenian