Oriental Orthodoxy

The term Oriental Orthodoxy refers to the communion of Eastern Christian Churches that recognize only the first four ecumenical councils — the First Council of Nicaea, the First Council of Constantinople, the First Council of Ephesus  and the Second 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 are collectively referred to as Eastern Orthodoxy.
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