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Holy See of the East is an honorary name of the sees of a number of Christian churches in the Middle East and India.
The Head of Malankara Marthoma Syrian Church Malankara Orthodox Syrian Church and the head of the Syro-Malabar Catholic Church is commonly known as the successor to the Holy Apostolic See of St. Thomas. The Seat of the Patriarchs of the Chaldean Catholic Church and the Nestorian Catholicos-Patriarchs which emerged from the Ancient Church of the East is also a part of the Holy See of the East.
Saint Thomas Christians after the Coonan Cross Oath who welcomed the Bishop Gregorios of the Syriac Orthodox Church in 1665 Church of Antioch claims the title of the Holy See of the East, since St. Thomas is the founder of this church. The Malankara Orthodox Syrian Church which evolved out of the Malankara Church as a part of the Oriental Orthodox Churches claims the title of the Catholicos of the East and the Holy Apostolic See of St. Thomas. The Malankara Syrian Catholic Church which evolved from the Malankara Church as a part of the Eastern Catholic Church in full communion with the Holy See of Rome also claims the title of the Catholicos and the Holy Apostolic See of St. Thomas.