Tyrannius Rufinus
After adopting Christianity, Mirian sent an ambassador to Byzantium, asking Emperor Constantine I to have a bishop and priests sent to Iberia. Constantine, having learned of Iberia’s conversion to Christianity, granted Mirian the new church land in Jerusalem and sent a delegation of bishops to the court of the Georgian King. Roman historian Tyrannius Rufinus in "Historia Ecclesiastica" writes about Mirian's request to Constantine: