May 13 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 May 13 are broadly the same, no matter which calendar is used.
Virgin-martyr Glyceria at Heraclea, Propontis (c. 138-161)
Martyr Laodicius, jailer of Saint Glyceria (c. 138-161)
Saint Theoctistus, monk from Tekoa, Palestine.
Saint Pausicacus, Bishop of Synnada (606)
Saint Nicephoros, Presbyter of the monastery of Ephapsios.
Saint Sergius (George) the Confessor of Constantinople, with his wife Irene and children (c. 829-842)
Saint Euthymius the New (the Illuminator) (1028), founder of Iveron Monastery, and his fellow Georgian saints of Mount Athos:
His father monk-martyr John of Iveron (998); his cousin monk-martyr George of Iveron (1065); and monk-martyr Gabriel of Iveron (10th century)
Saint Abbán of Ireland, baptized in 165 AD, missionary in Abingdon, Oxfordshire (2nd century)
Martyr Alexander of Rome (284-305)
Saint Valerian of Auxerre, third Bishop of Auxerre in France, and defender of Orthodoxy against Arianism. (350)
Saint Onesimus of Gaul, fifth Bishop of Soissons in France (361)
Saint Servatius, Bishop of Tongres, defender against Arianism in the Netherlands (384)
Saint Agnes of Poitiers, chosen by St. Radegund to be Abbess of Holy Cross at Poitiers in France (588)
Saint Mael (Mahel), Ascetic on the Isle of Bardsey (6th century)
Saint Natalis (Natale), Bishop of Milan in Italy (751)
Saint Anno (Hanno, Annon), Bishop of Verona in Italy (780)