Gregory the Illuminator was the founder and first official head of the Armenian Apostolic Church. He converted Armenia from Zoroastrianism to Christianity in the early fourth century, making Armenia the first state to adopt Christianity as its official religion. He is venerated as a saint in the Armenian Apostolic Church and in some other churches. 239 – 329; died at about 90. Alive at the same time as Constantine the Great, Nagarjuna, Diophantus of Alexandria, Cyprian, and Plotinus. Wiki link