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Between 325 and 681, Christians theologically articulated their view of the nature of Jesus Christ by a series of seven [[Ecumenical Councils]]. These councils described Christ as one person with a fully human and a fully divine nature, a doctrine known as the [[Hypostatic Union]] and defined at the [[Fourth Ecumenical Council|Council of Chalcedon]].

The [[Christology|Christological]] terminology defined at the Council of [[Council of Chalcedon]] is the main difference and the reason for the split between the [[Eastern Orthodox]] church and the [[Oriental Orthodox]] church, who only recognise the first three ecumenical councils.

At the first [[First Ecumenical Council|Council of Nicaea]] (325), Jesus Christ was declared as God, "consubstantial" with the Father. At the [[Third Ecumenical Council|Council of Ephesus]] (431), Jesus Christ was declared as only one person, though divine as well as human. At the [[Council of Chalcedon]], almost twenty years after Ephesus, Jesus Christ was declared to be two complete natures, one human and one divine.