One Holy Universal Apostolic Orthodox Armenian Church. Armenia
Image by Alexander Mkhitaryan
The Armenian Apostolic Church (Armenian: Հայաստանեայց Առաքելական Եկեղեցի, Hayastaneayc’ Aṙak’elakan Ekeġec’i) is the world’s oldest National Church and is one of the most ancient Christian communities. Armenia was the first country to adopt Christianity as its official religion in 301 AD, in establishing this church. The Armenian Apostolic Church traces its origins to the missions of Apostles Bartholomew and Thaddeus in the 1st century.
The official name of the Church is the One Holy Universal Apostolic Orthodox Armenian Church . It is sometimes referred to as the Gregorian Church, but the latter name is not preferred by the Church, as it views the Apostles Bartholomew and Thaddeus as the founders, and St. Gregory the Illuminator as merely the first official head of the Church. (from Wikipedia)