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Our father among the [[saint]]s '''Callistus I of Constantinople''', also ''Kallistos I''', was the patriarch of Constantinople for two periods, from 1350 to 1353 and from 1354 to 1363. He was a theologian and hagiographer, as well as a [[Hesychasm|hesychast]] who continued to support St. [[Gregory Palamas]] against the followers of [[Barlaam of Calabria]]. St. Callistus is commemorated on [[June 20]].