May 18 (Eastern Orthodox liturgics)
—Eastern Orthodox Church calendar—May 19
All fixed commemorations below celebrated on May 31 by Orthodox Churches on the Old Calendar.
For May 18th, Orthodox Churches on the Old Calendar commemorate the Saints listed on May 5.Saints
- Martyrs Peter of Lampsacus, Andrew, Paul, Dionysia, and Christina, under Decius
- Martyrs Heraclius, Paulinus, and Benedimus of Athens.
- Martyr Euphrasia of Nicaea
- Martyr Galactia
- Martyr Julian
- Martyr Theodotus of Ancyra, and with him eight virgin-martyrs:
- Martyr Dioscorus, in Cynopolis of Egypt
- Martyrs Symeon, Isaac, and Bachtisius of Persia
- Hieromartyr Potamon, Bishop of Heraclea in Egypt, and Confessor
- The Holy clergy and lay martyrs massacred under Emperor Valens
- Martyrs David and Tarechan, of Georgia
- Patriarch Stephen the New of Constantinople
- Saint Anastaso of Leukadion, near the Bithinian sea-shore
- Saint Martinian of Areovinthus, monk of the church of the Theotokos of the Areovinthus quarter, Constantinople
- Hosios Stephanos the Chorabyte
Pre-Schism Western saints
- Martyr Venantius of Camerino
- Hieromartyr Felix, Bishop of Spoleto, in Umbria
- Hieromartyr Pope John I of Rome
- Hieromartyr Pope Theodore I of Rome
- Martyr Merililaun, a pilgrim murdered near Rheims and venerated as a martyr
- Saint Feredarius, Abbot of Iona
- Saint Elgiva, Widow of King Edmund, Abbess of Shaftesbury
Post-Schism Orthodox saints
- Saint Macarius of the Altai, Archimandrite
- Saint John Gashkevich, Archpriest of Korma
- New Hieromartyr Michael Vinogradov, priest
- New Hieromartyr Damian Strbac, Jr., priest of Grahovo, Serbia
- New Hieromartyr Basil Krylov, priest
Other commemorations
- Translation of the relics of Saint Mildred of Thanet, Abbess of Minster-in-Thanet
- Repose of Blessed Philip, founder of the Gethsemane Caves Skete of St. Sergius Lavra
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