June 18 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 June 18 are broadly the same, no matter which calendar is used.
Martyrs Leontius, Hypatius and Theodoulos at Tripoli in Phoenicia (70–79)
Martyr Aetherus of Nicomedia (305)
Saint Marina the Virgin, of Bithynia (8th century)
Venerable Leontius the Shepherd, monk.
Saints Mark and Marcellian, twin brothers and deacons who suffered in Rome under Maximian (c. 287)
Saints Cyriacus and Paula of Málaga, two Christians, stoned to death in Málaga in Spain in the Diocletianic Persecution (305)
Martyr Elpidios, in Gaul (4th century)
Saint Amandus of Bordeaux, successor of St Delphinus as Bishop of Bordeaux in France, Confessor (c. 431)
Saint Alena of Brussels, martyr (c. 640)
Saint Calogerus the Anchorite, a Greek who lived for thirty-five years as a hermit near Girgenti in Sicily after preaching Christ in the isles of Lipari (c. 486)
Saints Gregory, Demetrius and Calogerus, respectively a bishop, archdeacon and abbot in North Africa, driven out by Arian Vandals (5th century)
Saint Fortunatus the Philosopher, a bishop driven from the north of Italy by the Lombards (c. 569)
Saint Osmanna (Osanna), a nun at the convent of Jouarre in France (c. 700)
Saint Guy of Baume, successor of St Berno at Baume Abbey in France, later a hermit near Fay-en-Bresse (c. 940)
Venerable Peter of Koriša, aristocrat who gave away his possessions to become a monk at the Monastery of the Holy Archangels, later a hermit in the Šar Mountains (1275) (see also: June 5 )
Venerable Leontius, canonarch of the Kiev Caves (14th century)
Venerable Leontius the Myrrh-gusher (Leontius the Hagiorite), of Argos and of Dionysiou monastery on Mount Athos, clairvoyant (1605)