Mar Thoma Darmo, a native of Mesopotamiam was Metropolitan of the Church of the East in India from 1952 to 1968, based at Trichur. In schism against the Catholicos Patriarch Mar Eshai Shimun XXIII because of issues of calendar and succession, he was named head of the Ancient Church of the East in October 1968 and relocated to Baghdad. He died there the following year. The Assyrian Church of the East is a church that traces its origins to the See of Babylon, said to be founded by Saint Thomas the Apostle. ... Thrissur is a city (located at 10. ... Mar Shimun XXI Ishaya, more properly known as Mar Eshai Shimun XXIII, Catholicos Patriarch of the Church of the East from 1920 until his assassination on November 6, 1975. ... The Ancient Church of the East is an offshoot of the Church of the East organized in 1968 in protest against hereditary succesion of bishops and against calendar changes. ...