Callistus I of Constantinople

Callistus I of Constantinople (; died August 1363) was the Ecumenical Patriarch of Constantinople for two periods from June 1350 to 1353 and from 1354 to 1363. Callistus I was an Athonite monk and supporter of Gregory Palamas. He died in Constantinople in August 1363.

Life Nothing is known of Callistus' early life. He was a disciple of Gregory Palamas and Gregory of Sinai. He lived at Mount Athos for 28 years and was a monk at the Skete of Magoula near Philotheou Monastery at Mount Athos.

In 1353, Callistus I refused to crown Matthew Kantakouzenos, son of emperor John VI Kantakouzenos, as emperor with his father and, as a result, was deposed. After his deposition, Callistus I returned to Mount Athos. In 1354, after John VI abdicated, Callistus I returned as patriarch. After his return, Callistus I worked to strengthen the administration of the Patriarchate. He reorganized the parish system of churches under the surveillance of a patriarchal exarch. He also strove to strengthen patriarchal control over various Orthodox church jurisdictions, even to the extent of excommunicating Stefan Dušan, for establishing the Serbian archbishop as an independent patriarch.

In 1355, Callistus I wrote to the clergy of Trnovo that those Latins who had baptised by single immersion should be re-baptised. He called the baptism by one immersion most improper and full of impiety. His view was based on the Apostolic canons which clearly state that those baptised by one immersion are not baptised and should be re-baptised.

Death Callistus I died in August 1363 while he was en route to Serres as a member of the embassy of emperor John V Palaiologos seeking aid from Helena of Bulgaria, Empress of Serbia against the Ottoman Empire.

While Callistus I was Patriarch, he once passed through Mount Athos on his way to Serbia and met Maximos of Kafsokalyvia, who greeted the Patriarch in a humorous manner, "This old man will never see his old lady again". This turned out to be a prophecy of how Callistus I would never see Constantinople ("his old lady") again, since he would die before being able to return there. Maximos then bid farewell to Callistus I by chanting, "Blessed are the blameless in the way" (from Psalm 118, a funeral psalm). Callistus I subsequently journeyed on to Serbia, where he then died. (Note that the "Callistus I" in this account is often confused with Callistus II of Constantinople, who reigned as Patriarch in 1397, after the death of Maximos of Kafsokalyvia.)

Works With another monk, Ignatius Xanthopoulos, with whom he had developed a life-long friendship at Mount Athos, Callistus I composed the important Century, a tract of 100 sections on the ascetical practices of the Hesychastic monks; it was incorporated in the Philokalia of Nicodemus the Hagiorite and had a great influence on Orthodox spirituality. In the Philokalia, the full title of the work is An exact rule and method with God's help for those who choose to live as hesychasts and monastics by the monks Kallistos and Ignatios Xanthopoulos, including testimonies from the saints.

Callistus I wrote the life of his teacher Gregory of Sinai probably around 1351. The date of composition is suggested by the editor based on the references to Callistus I's clash with Nicephorus Gregoras at the final Palamite council.

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