Hierarch · 14th century
Saint Callistus Patriarch of Constantinople
Also known as Callistus I · Kallistos I
A monk of Athos and disciple of St Gregory of Sinai who twice served as patriarch of Constantinople, a defender of the hesychast fathers and writer on the life of prayer.
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- St. Gregory the Theologian · Hierarch
- St. Gregory Palamas · Hierarch
- St. Sava I, First Archbishop of Serbia · Hierarch
- St. Gregory the Dialogist · Hierarch
- Saint Cyril, Bishop of Turov · Hierarch
- Saint Simon, Bishop of Vladimir and Suzdal · Hierarch
Sources: OCA Synaxarion (oca.org), Lives of the Saints