Sources: Agathangelos, History of the Armenians (~5th century); Faustus of Byzantium; Moses of Khoren, History of Armenia.

The Armenian Apostolic Church (~301 AD) is traditionally the world’s oldest state church — Armenia became the first nation to adopt Christianity as its official religion, approximately a decade before Constantine’s Edict of Milan. The conversion story: Gregory the Illuminator, imprisoned for 13 years by King Tiridates III, healed the king of a disease after a divine vision; Tiridates converted and declared Christianity the state religion (~301 AD). The theological distinctives that separate Armenian Christianity: (1) Miaphysitism — after Chalcedon (451 AD), the Armenian church rejected the council’s two-natures formula, holding that Christ has one united nature (divine and human) rather than two natures in one person. This was not Eutychianism (which confused the natures) but a different terminological tradition going back to Cyril of Alexandria. (2) The Armenian Bible — translated in the 5th century by Mesrop Mashtots, who invented the Armenian alphabet specifically for this purpose; the Armenian version is considered one of the most accurate ancient translations. (3) The Apostolic foundation — tradition holds the church was founded by apostles Thaddaeus and Bartholomew. The Armenian church’s survival through centuries of Persian, Byzantine, Arab, Mongol, Ottoman, and Soviet rule — including the 1915 genocide — is one of religious history’s most remarkable stories of institutional resilience.