Nestorian Schism

The Nestorian Schism was the split between the Byzantine church of the West and the Assyrian church of the East in the 5th century.
Nestorius was a student of Theodore of Mopsuestia at the middle School of Antioch before he became Patriarch of Constantinople. He was condemned by Cyril of Alexandria and the First Council of Ephesus (431) for refusing to call the Virgin Mary by the title Theotokos (Mother of God); he instead insisted to refer to her by the title Christokos Mother of Christ. He was further condemned for splitting Christ into two persons, although he clearly denied that accusation (see Nestorianism for detailed information on Nestorius's teachings). The whole affair was complicated by the dubious arguments of Cyril of Alexandria, which soon provoked the Monophysite Schism.
In the Syriac speaking world, and especially in the School of Edessa, Theodore was held in high esteem and the followers of his pupil Nestorius were given refuge. The Persian kings, who were at constant war with Byzantium, saw the opportunity to assure the loyalty of their Christian subjects and supported the Nestorian schism: 
* They granted protection to Nestorians (462).
* They executed the pro-Byzantine Catholicos Babowai who was then replaced by the Nestorian Bishop of Nisibis Bar Sauma (484).
* They allowed the transfer of the school of Edessa to the Persian city Nisibis when the Byzantine emperor closed it for its Nestorian tendencies (489).
The writings of Nestorius were introduced at the school of Edessa-Nisibis only in about 530, a hundred years after Ephesus.
The main theological authorities of the school and all the Assyrian Church have always been Theodore and his teacher Diodorus of Tarsus. Unfortunately, close to nothing of their writings has survived. 
At the end of the 6th century the school went through a theological crisis when its director, Henana of Adiabene, tried to replace Theodore by his own doctrine, which followed Origen. Babai the Great (551–628), who was also the unofficial head of the Church at that time and revived the Assyrian monastic movement, refuted him and in the process wrote the normative Christology of the Assyrian Church, based on Theodore of Mopsuestia.
According to Babai the Great, Christ has two qnome (Assyrian: ܩܢܘܡܐ , "essences") which are unmingled and eternally united in one parsopa (Assyrian: ܦܪܣܘܦܐ , "personality"). This, and not Nestorianism, is the teaching of the Assyrian Church.
Category:Schisms in Christianity
Category:5th-century Christianity
 
Category:Christianity in Iran
Category:Christianity in Iraq
Category:Eastern Christianity
Church of the East, Assyrian