May 12 - Eastern Orthodox Church calendar - May 14

All fixed commemorations below celebrated on May 26 by Orthodox Churches on the Old Calendar.^{[note 1]}

For May 13th, Orthodox Churches on the Old Calendar commemorate the Saints listed on April 30.

• Saint-Righteous Gamaliel the Elder, Pharisee, Teacher of The Law (mid-1st century)^[1]
• Virgin-martyr Glyceria at Heraclea, Propontis (c. 138-161)^[2][3]
• Martyr Laodicius, jailer of Saint Glyceria (c. 138-161)^[4][5]
• Saint Theoctistus, monk from Tekoa, Palestine^{[6][note 2]}
• Saint Pausicacus, Bishop of Synnada (606)^[11]
• Saint Nicephoros, Presbyter of the monastery of Ephapsios^{[12][note 3]}
• Saint Sergius (George) the Confessor of Constantinople, with his wife Irene and children (c. 829-842)^[13][14]
• Saint Euthymius the New (the Illuminator) (1028),^[15] founder of Iveron Monastery, and his fellow Georgian saints of Mount Athos:

• His father monk-martyr John of Iveron (998);^[16] his cousin monk-martyr George of Iveron (1065);^[17] and monk-martyr Gabriel of Iveron (10th century)^[18][19]

• Saint Abban of Ireland, baptized in 165 AD, missionary in Abingdon, Oxfordshire (2nd century)^[20]
• Martyr Alexander of Rome (284-305)^[21][22]
• Saint Valerian of Auxerre, third Bishop of Auxerre in France, and defender of Orthodoxy against Arianism. (350)^[23][24]
• Saint Onesimus of Gaul, fifth Bishop of Soissons in France (361)^[24][25]
• Saint Servatius, Bishop of Tongres, defender against Arianism in the Netherlands (384)^[3][24][26]
• Saint Agnes of Poitiers, chosen by St. Radegund to be Abbess of Holy Cross at Poitiers in France (588)^[24]
• Saint Mael (Mahel), Ascetic on the Isle of Bardsey (6th century)^[24]
• Saint Natalis (Natale), Bishop of Milan in Italy (751)^[24]
• Saint Anno (Hanno, Annon), Bishop of Verona in Italy (780)^[24]
• Saint Merwenna of Rumsey (Merwinna, Merewenna), first Abbess of Rumsey convent, in Hampshire (c. 970)^{[27][28][note 4]}
• Blessed Fortis Gabrielli, Ascetic (1040)^[24]

• Venerable monk-martyrs of Iveron Monastery, martyred by the Latins (c. 1259-1280)^{[29][30][31][note 5]}
• Repose of Saint Macarius, Abbot of Glushitsa Monastery, Vologda (1480)^{[19][32][33][note 6]}
• Righteous Virgin Glyceria of Novgorod (1522)^[19][34]

• Consecration of the Monastery of Panagia Pantanassa (Most-Holy Queen of All), on the small island of Hagia Glykeria (Incirli Adasi) in the Bay of Tuzla (12th century)^[37]
• Translation of the relics (1688) of Hieromartyr Saint Macarius, Archimandrite of Ovruch and Pinsk, from Kaniv to Pereyaslavl (1678)^{[19][33][38][note 7]}
• Repose of righteous Priest Alexis of Bortsurmany, disciple of St. Seraphim of Sarov (1848)^[39]
• Repose of Rassophore Monk John, of St. Nilus of Sora Monastery (1863)^[19]
• Repose of Eldress Sepfora of Klykovo (1997)^[19]

• St. Glyceria.
• St. Euthymius of Athos
• St. George the Hagiorite.
• St. Servatius, Bishop of Tongres.