Patriarch of Babylon of the Chaldeans

This is a list of the Chaldean Catholicos-Patriarchs of Babylon, the leaders of the Chaldean Catholic Church and one of the Patriarchs of the east of the Catholic Church starting from 1553 following the Schism of 1552 which caused a break from the Assyrian Church and the subsequent founding of the Church of Assyria and Mosul, later called the Chaldean Catholic Church.

This list continues from the List of Patriarchs of the Church of the East that traces itself back from the Church founded in Assyria first mentioned in the 1st century under Simon Peter in 1 Peter 5:13 out of which grew the Church of the East. It was Catholicos Timothy I Al-Baghdadi incorporated the numerically dominant St. Thomas Christians under the Apostolic See of the Catholicos-Patriarch of Babylon, which is often wrongly attributed to St. Thomas as a result.

The term Chaldean Catholic Patriarchs of Babylon is somewhat inaccurate in a geographical and historical context, as the Church was an offshoot of the Assyrian Church, and founded by priests from Upper Mesopotamia, a region which had been Assyria, rather than in southern Mesopotamia where Babylonia and Chaldea had once been.

In 1553, Mar Yohannan Sulaqa, willing to separate from the Church of the East's Patriarchal See of Alqosh, an Assyrian town in the Assyrian homeland in northern Iraq, went to Rome asking for his appointment as Patriarch. He was consecrated in St. Peter's Basilica on 9 April 1553.

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