Church of the East
The Church of the East is that branch of Syriac Christianity which was formerly called Nestorian, and owes its existence to the condemnation of Nestorius and his followers at the Council of Ephesus in 433, and the political division of the Syriac-speaking world between the Roman and Persian empires. Since 1994 the church has been in full communion with Rome.
An earlier attempt at union produced the uniate Chaldean church which uses the same rites but is under the authority of Rome.
The Church of the East uses the East Syriac dialect and bookhand.