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The Oriental Orthodox Communion refers to the churches of Eastern Christian traditions that keep the faith of only the first three [[ecumenical councils]] and reject the the [[Council of Chalcedon]]. Thus, despite potentially confusing nomenclature, Oriental Orthodox churches are distinct from the churches that collectively refer to themselves as [[Eastern Orthodoxy]]. The Oriental Orthodox churches came to a parting of the ways with the remainder of Christianity in the 5th century. The key difference was the views of the Council of Chalcedon in 451. The separation resulted in part from the Oriental Orthodox churches' refusal to accept the view that [[Nature of Christ|Jesus has two natures]] — , one divine and one human, as had been defined by the [[Council of Chalcedon]] ([[Fourth Ecumenical Council]]) of 451. Instead, the churches used the terminology of [[Miaphysitism]] which said that Jesus Christ is fully human and fully divine in one nature or "physis". The Oriental Churches include the [[Armenian Apostolic Church]], [[Coptic Orthodox Church]] and the [[Syrian Orthodox Church]].