The Ancient Church of the East is an Eastern Christian denomination. It branched from the Assyrian Church of the East in 1964, under the leadership of Mar Toma Darmo. It is one of three Assyrian Churches that claim continuity with the historical Church of the East, the others being the Assyrian Church of the East and the Chaldean Catholic Church. Since 1969, the see of the Ancient Church of the East is headquartered in Baghdad.

Mar Mari Emmanuel is an Iraqi-born, Assyrian Australian prelate. He is the bishop of Christ the Good Shepherd Church in Wakeley, New South Wales, which hosts the highest number of Assyrian Christians—many of them refugees from Iraq and Syria—in any suburban Australian neighbourhood.