Chaldean Christians are a group of Nestorians who broke from the ancient Apostolic Church of the East in what is known as the Schism of 1552 by entering into the Roman Communion, after at first failing to gain acceptance within the Syriac Orthodox Church.
Chaldean Christians are a group of Nestorians who broke from the ancient Apostolic Church of the East in 1681. They joined the Church of Athura and Mosul which 128years earlier had already split with the Nestorians in what is known as the Schism of 1552 by entering into the Roman Communion in 1553 after at first failing to gain acceptance within the Syriac Orthodox Church.