Commemoration of the Holy Fathers of the First Ecumenical Council (325); Venerable Pachomius the Great (346; Venerable Achilles, bishop of Larissa (330); St. Isaiah, bishop and wonderworker of Rostov (1090); Venerable Isaiah of the Kyiv Caves Abbey (1115). Venerable Pachomius, abbot and Silvanus of Nerekhta (1384).