Saint Diadochos, Bishop of Photike in Epirus, spiritual writer.
St. Diadochos was Bishop of Photike in Epirus in the fifth century and one of the great teachers of the spiritual life. His work of one hundred chapters On Spiritual Knowledge, included in the Philokalia, teaches the remembrance of God and the invocation of the name of Jesus, and was read by St. Maximos the Confessor and many later fathers.
He took part in the defense of the Council of Chalcedon and reposed in peace. His memory is kept on March 29.
Feast day
On the New Calendar, Diadochos of Photike is commemorated on March 29. Churches on the Old (Julian) Calendar keep the feast on April 11 of the civil calendar.
Also commemorated on March 29

Savvas of Kalymnos
Venerable, Σάββας ο εν Καλύμνω
Venerable Savvas the New of Kalymnos, iconographer and confessor.
Cyril the Deacon
Martyr, Κύριλλος ο Διάκονος
Holy Martyr Cyril the Deacon of Heliopolis, and the martyrs of Ascalon and Gaza.
Jonah and Barachesios
Martyr, Ιωνάς και Βαραχήσιος
Holy Martyrs Jonah and Barachesios and their companions in Persia.
Eustathios of Kios
Hierarch, Ευστάθιος Κίου
Saint Eustathios the Confessor, Bishop of Kios in Bithynia.