Armenian Apostolic Orthodox Church
Armenia, a land beyond the reach of the Roman Empire) was the first country to establish Christianity as the state religion (301 CE). The Armenian Apostolic Orthodox Church participated in the first three Ecumenical Councils of the Christian movement, but was not represented at the fourth council (Chacedon, 431) and later refused to ratify its pronouncements. It formally split with the Eastern orthodox churches in 554, and later replaced Greek with Armenian as it official language.