Commemoration of the Holy Fathers of the Second Ecumenical Council at Constantinople.
The Second Ecumenical Council was convened at Constantinople in 381 under the Emperor Theodosius the Great. Led by Saints Meletios of Antioch, Gregory the Theologian and Gregory of Nyssa, the Fathers condemned the heresy of Macedonius against the Holy Spirit and completed the Creed.
The Church keeps their memory on May 22.
Feast day
On the New Calendar, Fathers of the Second Ecumenical Council is commemorated on May 22. Churches on the Old (Julian) Calendar keep the feast on June 4 of the civil calendar.
Also commemorated on May 22

Paul the Peloponnesian
Martyr, Παύλος ο Πελοποννήσιος
Venerable Martyr Paul of Aroania, an Athonite monk beheaded at Tripolis.
Sophia the Physician
Holy Woman, Σοφία η Ιατρός
Venerable Sophia the Physician, who healed the sick and served the poor.
John Vladimir of Serbia
Saint, Ιωάννης Βλαδίμηρος
Holy King John Vladimir of Serbia, wonderworker, beheaded by treachery.
Zacharias of Prousa
Hierarch, Ζαχαρίας ο Νέος Προύσης
Hieromartyr Zacharias the New of Prousa, a priest beheaded for returning to Christ.