The Iberian king Mirian III adopted Christianity as a state religion in AD 327 (this event is attributed to the mission of a Cappadocian woman, Saint Nino, who since 303 had preached Christianity in Iberia), and Iberia allied itself with the Roman Emperor Constantine the Great.
Upon the death of Aspagur, Mirian was installed on the throne of Iberia by his father whom the medieval Georgian chronicles refer to as "K'asre" (Khosrau), Great King of Iran.
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