Controversies over how Jesus' human and divine natures co-existed led to a series of ecumenical councils: the Third in 431, the Fourth in 451, the Fifth in 583, and the Sixth in 680681. The Fourth Council's assertion – that two separate natures of Christ form one ontological entity – was rejected by the Armenian, Assyrian, and Egyptian churches, who split from the rest of Christianity and combined into Oriental Orthodoxy.
controversies over how jesus' human and divine natures co-existed led to a series of ecumenical councils the third in 431 the fourth in 451 the fifth in 583 and the sixth in 680681 the fourth council's assertion – that two separate natures of christ form one ontological entity – was rejected by the armenian assyrian and egyptian churches who split from the rest of christianity and combined into oriental orthodoxy