Mirian III (Georgian: მირიან III) was a king of Iberia or Kartli (Georgia), contemporaneous to the Roman emperor Constantine the Great (r. 306–337). He was the founder of the royal Chosroid dynasty. According to the early medieval Georgian annals and hagiography, Mirian was the first Christian king of Iberia, converted through the ministry of Nino, a Cappadocian female missionary. After Christianization of Iberia he is credited with establishment of Christianity as his kingdom's state religion and is regarded by the Georgian Orthodox Church as saint and is canonized as Saint Equal to the Apostles King Mirian (Georgian: წმინდა მოციქულთასწორი მეფე მირიანი).