know only one Christ, the Word from God the Father with his own flesh... But we do not say that the Word from God dwelt as in an ordinary human born of the holy virgin... we understand that, when he became flesh, not in the same way as he is said to dwell among the saints do we distinguish the manner of the indwelling; but he was united by nature and not turned into flesh... There is, then, one Christ and Son and Lord, not with the sort of conjunction that a human being might have with God as in a unity of dignity or authority; for equality of honor does not unite natures. For Peter and John were equal to each other in honor, both of them being apostles and holy disciples, but the two were not one. Nor do we understand the manner of conjunction to be one of juxtaposition, for this is insufficient in regard to natural union.... Rather we reject the term 'conjunction' as being inadequate to express the union... [T]he holy virgin gave birth in the flesh to God united with the flesh according to hypostasis, for that reason we call her Theotokos... If anyone does not confess that Emmanuel is, in truth, God, and therefore that the holy virgin is Theotokos (for she bore in a fleshly manner the Word from God become flesh), let him be anathema. (Cyril's third letter to Nestorius) Nestorian Schism The Nestorian Church, known as the Church of the East within the Syrian tradition, rejected the decision of the Council of Ephesus and its confirmation at the Council of Chalcedon in 451. This was the church of the Sassanid Empire during the late 5th and early 6th centuries. The schism ended in 544, when patriarch Aba I ratified the decision of Chalcedon. After this, there was no longer technically any "Nestorian Church", i.e. a church following the doctrine of Nestorianism, although legends persisted that still further to the east such a church was still in existence (associated in particular with the figure of Prester John), and the label of "Nestorian" continued to be applied even though it was technically no longer correct. Modern research suggests that also the Church of the East in China did not teach a doctrine of two distinct natures of Christ." Reformation Lutheran tradition retained the title of "Mother of God" (German Mutter Gottes, Gottesmutter),