John the Iberian (; died ) was a Georgian monk and Orthodox saint, venerated for his piety and leadership on Mount Athos. He was one of the founders of Iviron monastery, a major center of Georgian monastic culture on Athos.
A member of a Georgian noble family from Tao-Klarjeti in southern Georgia, John the Iberian was initially married and served as a military commander. In the early 960s, following personal and spiritual transformations, he was tonsured as a monk at the lavra of the Four Churches in Tao-Klarjeti. Seeking further spiritual guidance, he traveled to Mount Olympus (modern UludaÃÂ) in Bithynia, a renowned center of Byzantine monasticism, and subsequently to Constantinople to secure the release of his son, Euthymius the Illuminator (Euthymius Opplyseren), who had been held hostage by the Byzantine emperor.
John and Euthymius quickly attracted followers due to their piety and leadership, eventually retiring to the monastery of Saint Athanasius on Mount Athos, a major center of Orthodox monastic life. Together with JohnâÂÂs brother-in-law, the retired general John Thornikos, they founded Iviron monastery as a center of Georgian monastic culture on Athos. John served as Iviron's first abbot, overseeing its spiritual, administrative, and cultural development. Under his guidance, the monastery became a hub for Georgian art, manuscript production, and liturgical scholarship, strengthening connections between Georgian and Byzantine religious communities. He continued to serve the Iviron community until his death in 1002, leaving a lasting legacy celebrated by both Georgian and Athonite Orthodox traditions.