https://en.wikipedia.org/wiki/Armenian_Apostolic_Church
The Armenian Apostolic Church (Armenian: Հայ Առաքելական Եկեղեցի, romanized: Hay Aṙak'elakan Yekeghetsi) is the national church of the Armenian people.Part of Oriental Orthodoxy, it is one of the most ancient Christian institutions. The Kingdom of Armenia was the first state to adopt Christianity as its official religion under the rule of King Tiridates III of the Arsacid ...