Callistus I of Constantinople
Saint Callistus I of Constantinople | |
|---|---|
| Ecumenical Patriarch of Constantinople | |
| Church | Church of Constantinople |
| In office | 10 June 1350 – 15 August 1353 January 1355 – August 1363 |
| Predecessor | Isidore I of Constantinople Philotheus I of Constantinople |
| Successor | Philotheus I of Constantinople Philotheus I of Constantinople |
| Personal details | |
| Died | August 1363 Serbia |
| Sainthood | |
| Feast day | 20 June |
| Venerated in | Eastern Orthodox Church |
Callistus I of Constantinople (Medieval Greek: Κάλλιστος; 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.