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==Life==
Nothing is known of Callistus' early life. He was [[disciple]] of Gregory Palamas and Gregory of Sinai. He lived an [[aseticismAsceticism|ascetic]] life as a [[monk]] at [[Mount Athos]] in the [[Skete]] of Magoula of the [[Monastery]] of [[Philotheou Monastery (Athos)|Philotheou]] for twenty eight years. He also founded the Monastery of St. Mamas at Tenedos, a small island near the Dardanelles.
Callistus was elected to the throne of the [[see]] of Constantinople in June 1350, succeeding Patr. [[Isidore I Buchiras of Constantinople|Isidore]]. In 1351, he convened a [[synod]] in Constantinople that finally established the Orthodoxy of Hesychasm.
