April 5 in Eastern Orthodox liturgical calendars is a feast day and a day of commemoration of saints and martyrs. Although some Orthodox churches use the Revised Julian Calendar and others use the traditional Julian calendar, the fixed commemorations for their respective April 5 are broadly the same, no matter which calendar is used.
Martyrs Claudius, Diodorus, Victor, Victorinus, Pappias, Serapion and Nicephorus, at Corinth (251 or 258)
Martyrs Theodulus, Reader, and Agathopodes, Deacon, and those with them, at Thessaloniki (c. 303) (see also: April 4 - Greek)
Martyrs Zenon, by fire, Maximus, Terentius and Pompeius, by the sword (250) (see also: October 28, March 13, April 10)
Martyr Thermos (Fermus, Firmus), by fire.
The Holy Noble Lady (sister of martyr Thermos/Fermus), and her Servant, martyrs, by the sword.
Holy Five Young Virgin-Martyrs of Lesbos, by the sword.
Virgin-martyr Theodora and Martyr Didymus the Soldier, of Alexandria (304) (see also: May 27)
Venerable Martyr Ypomoni (Hypomoni, Evpomoni).
Venerable Publius of Egypt, monk (4th century) (see also: April 4 - Greek)
Saints Theonas, Symeon, and Phorbinus, of Egypt (4th century) (see also: April 4 - Greek)
Venerable Mark the Anchorite of Athens (ca. 400)
Venerable Plato the Confessor, Abbot of the Studion (813) (see also: April 4 - Greek)
Venerable Theodora of Thessaloniki (886)
Holy Martyrs of North-West Africa, a large group martyred at the Easter liturgy by Genseric, the Arian King of the Vandals (459)
Saint Bécán (Began), one of the 'Twelve Apostles of Ireland' (6th century)
Venerable Derfel-Gadarn, a soldier and afterwards a hermit in Llanderfel in Gwynedd in Wales (6th century) (see also: April 6 - Greek)
Saint Æthelburh of Kent (c. 647)