The Armenian Rite is one of the more ancient liturgies of the Catholic Church. it has its origins from the ancient Syriac and Cappadocian Liturgical rites which are considered to be the father churches of the Armenian church.
Armenia was said to have been first evangelized by the Apostles Bartholomew and Jude Thaddeus who converted a few Armenians during the first century and established a small and persecuted Armenian church within an overwhelmingly pagan nation in Lesser Armenia which was comprised of Edessa. The apostles managed to convert king Abgar of Edessa who died a couple of years after his baptism and had his realm restored to paganism by his pagan son Ananias. Both apostles were later martyred for the faith in the vicinity of Armenia.
The next chapter for the church in Armenia began with a son of a nobleman whose father was killed for being seen as a political enemy by the king and was taken by his caretakers to Cappadocia in the roman empire to be brought up as a devout Catholic by the priest Phirmilianos who educated him in the Catholic faith. Legend has it that he ventured off to evangelize his homeland but was immediately imprisoned by the king for 12 years in a pit where he remained until king Tiridates went insane after suffering a major loss in a war with the roman empire. Gregory was released from his imprisonment in 297 and was brought forth to cure the king’s ailment, which he did accomplish immediately after baptizing Tiridates III. The King then made the Catholic faith the state religion and from then on Armenia became known as the first Catholic nation with Georgia and Ethiopia following suit.
After the conversion of the state, Armenia became a nominally Catholic nation with the liturgical language of the church being Syriac and Greek. It would not be until 405 AD when St Mesrob, an ordained priest-monk(vardapet), created a writing system for the Armenian language when the mass was finally translated to the vernacular. Afterwards, the last vestiges of paganism were wiped out of the kingdom and the church produced many saints such as St. Sahag.