December 18 (Eastern Orthodox liturgics)
- Eastern Orthodox liturgical calendar - December 19
All fixed commemorations below celebrated on December 31 by Eastern Orthodox Churches on the Old Calendar.
For December 18th, Orthodox Churches on the Old Calendar commemorate the Saints listed on December 5.Saints
- Martyr Eubotius, at Cyzicus
- Martyrs Phocas and Hermilas, by the sword.
- Hieromartyrs Zacchaeus, Deacon, and Alphaeus, reader, at Caesarea.
- Hieromartyr Modestus I, Archbishop of Jerusalem
- Saint Florus, Bishop of Amisus
- Saint Michael the Confessor, at Constantinople
- Saint Sophia the Wonderworker.
- Venerable Nomon.
Pre-Schism Western saints
- Martyrs Rufus and Zosimus, at Philippi in Macedonia
- Martyr Moses, a martyr in North Africa who probably suffered under Decius
- Martyrs Quintus, Simplicius and Companions, in North Africa under the Emperors Decius and Valerian
- Martyrs Victurus, Victor, Victorinus, Adjutor, Quartus and 30 other companions, in North Africa.
- Martyr Sebastian, at Rome, and his companions:
- Saint Gatianus of Tours, first Bishop of Tours
- Saint Bodagisil, founded and was the first Abbot of a monastery on the Meuse in Belgium
- Saint Samthann, foundress of the convent of Clonbroney in Co. Longford in Ireland
- Saint Flannán, first Bishop of Killaloe in Ireland
- Saint Desiderius of Fontenelle, son of St Waningus
- Saint Winebald, Abbot of Heidenheim and Bishop of Eichstatt
Post-Schism Orthodox saints
- Saint Daniel the Hesychast, of Voroneț Monastery, Romania
- Venerable Sebastian, Abbot of Poshekhonye Monastery
- Martyr Victor Matveev
- New Hieromartyr Thaddeus, Archbishop of Tver
- New Hieromartyr Nicholas, Archbishop of Great Ustiug
- New Hieromartyrs :
- * Andrew Voskresensky of Moscow,
- * John Mironsky of Chimkent,
- * Vladimir Preobrazhensky of Chimkent, and
- * Elias Benemansky of Tver, Priests
- New Hieromartyr Sergius Astakhov, Deacon
- Virgin-martyr Vera Truks of Zhitomir
Other commemorations
- Consecration of the Church of the Theotokos in Halkoprateia-Constantinople.
- Glorification of Righteous Simeon, Wonderworker of Verkhoturye
- Repose of Schemanun Nazaria, Eldress of Varatec Monastery
- Repose of Metropolitan Benjamin of Moldavia
- Slaying of Hieromonk Nestor of Zharki
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