Callistus II of Constantinople

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Callistus II Xanthopoulos or Xanthopulus (Greek: Κάλλιστος Β' Ξανθόπουλος) was a Byzantine Hesychast monk and spiritual writer who reigned as Ecumenical Patriarch of Constantinople in 1397. He was Patriarch through the reign of the Byzantine Emperor Manuel II Palaiologos, and through his short Patriarchal reign Constantinople was under siege by the Ottoman Sultan Bayezid I.

His surname indicates that he was from the monastery of Xanthopoulos. With another monk, Ignatius Xanthopoulos, Callistus 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. The majority of Patriarchs in the 14th century were monks in the Hesychast tradition.[1] Within the Orthodox Church, his memory is celebrated on 22 November.[2][3]


  1. J.M. Hussey. (1986). The Orthodox Church in the Byzantine Empire, Oxford University Press, p. 289.
  2. Κάλλιστος Β´ Ξανθόπουλος (in Greek). Ecumenical Patriarchate. Retrieved 2012-05-29. <templatestyles src="Module:Citation/CS1/styles.css"></templatestyles>
  3. Great Synaxaristes: (Greek) Ὁ Ὅσιος Κάλλιστος ὁ Β’ Πατριάρχης Κωνσταντινουπόλεως. 22 Νοεμβρίου. ΜΕΓΑΣ ΣΥΝΑΞΑΡΙΣΤΗΣ.


Eastern Orthodox Church titles
Preceded by
Antony IV
Patriarch of Constantinople
Succeeded by
Matthew I