May 10 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 10 are broadly the same, no matter which calendar is used.
Saint Simon the Zealot, Apostle (1st century)
Martyr Hesychius the Palatine of Antioch (c. 304)
Saint Isidora the Fool-for-Christ, of Tabennisi, Egypt (c. 365)
Saint Isidore of Alexandria (Isidore The Simple-Minded) (319-404), (404)
Venerable Passarion the Presbyter (Passarion of Palestine), Agapius and Philemon (mid-5th century)
Blessed Thais (Taisia) of Egypt (5th century)
Saint Laurence of Egypt, monk, of Egypt (6th century)
Martyrs Calepodius, Palmatius, Simplicius, Felix, Blanda and Companions (c. 222–232)
Martyrs Alphius, Philadelphus, Cyprian, at Lentini in Sicily (251)
Martyrs Erasmus, Onesimus, and 14 other martyrs, in Sicily (251)
Saint Aurelian of Limoges, Disciple of St Martial of Limoges in France (3rd century)
Martyrs Quartus and Quintus, two citizens of Capua who were condemned and executed in Rome.
Saint Conleth, hermit and first Bishop of Kildare (c. 519) (see also: May 3 and May 4)
Saint Comgall, founder and abbot of Bangor (602)of Egypt
Saint Cataldus, born in Munster in Ireland, became a monk at Lismore, then Bishop of Taranto; renowned for miracles (7th century)
Virgin-martyr Solangia (Solange) (880)
Saint Simon of Vladimir and Suzdal, Kiev Caves, Bishop (1226)