August 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 August 5 are broadly the same, no matter which calendar is used.
Forefeast of the Transfiguration of Jesus.
Hieromartyrs Antherus (236) and Fabian (Fabianus) (250), Popes of Rome.
Martyr Pontius, at Cimella in Gaul (257)
Martyr Eusignius of Antioch (362)
Righteous Nonna (374), wife of Gregory of Nazianzus the Elder and mother of St. Gregory the Theologian.
Martyrs Cantidius and Cantidianus, brothers, of Egypt, by stoning (4th century)
Martyr Sibelius (Sobel) of Egypt, shot by bow and arrow (4th century)
Saint Therissos (Thyrsos), Bishop of Karpasia, Cyprus.
Saint Euthymius I, Patriarch of Constantinople (917)
Saint Memmius (Menge, Meinge), Founder and first Bishop of Châlons-sur-Marne in France, and Apostle of the region (c. 300)
Twenty-three (23) Martyrs of Rome, on the Salarian Way in Rome, under Diocletian (303)
Saint Emygdius (Emidius), a saint whose relics were venerated in Ascoli in Italy (c. 303)
Martyr Afra, in Augsburg in Germany, under Diocletian (c. 304)
Saint Paris, Bishop of Teano near Naples in Italy (346)
Saint Cassian of Autun, Bishop of Autun in France, 314-350, he succeeded St Reticius and was famous for his miracles (c. 350)
Saint Venantius, the most famous of the ancient Bishops of Viviers in France (544)
Martyr Oswald of Northumbria, King of Northumbria (642)