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The term Oriental Orthodoxy refers to the communion of Eastern Christian Churches that recognize only the first three ecumenical councils — the First Council of Nicaea, the First Council of Constantinople and the Council of Ephesus — and reject the dogmatic definitions of the Council of Chalcedon. Hence, these Churches are also called Old Oriental Churches. Despite potentially confusing nomenclature, Oriental Orthodox churches are distinct from the churches that collectively refer to themselves as Eastern Orthodoxy.