Mirian III of Iberia was a 4th-century monarch who established Christianity as the official state religion of his kingdom. Born in the Sasanian Empire, he was placed on the Iberian throne by the Persian King Bahram II to ensure Sasanian influence in the Caucasus. As the founder of the Chosroid dynasty, his reign marked a significant transition for the region, moving away from Zoroastrian traditions toward a Christian identity. He is remembered for his conversion through the missionary work of Nino and for his efforts to centralize royal authority through the new faith.