April 5 (Eastern Orthodox liturgics)
- Eastern Orthodox liturgical calendar - April 6
All fixed commemorations below are observed on April 18 by Eastern Orthodox Churches on the Old Calendar.
For April 4th, Orthodox Churches on the Old Calendar commemorate the Saints listed on March 23.Saints
- Martyrs Claudius, Diodorus, Victor, Victorinus, Pappias, Serapion and Nicephorus, at Corinth
- Martyrs Theodulus, Reader, and Agathopodes, Deacon, and those with them, at Thessaloniki
- Martyr Zenon, by fire.
- Martyr Thermos, by fire.
- The Holy Noble Lady, and her Servant, martyrs, by the sword.
- Martyrs Maximus and Terentius, by the sword.
- Martyr Pompeius, by the sword.
- Holy Five Young Virgin-Martyrs of Lesbos, by the sword.
- Virgin-martyr Theodora and Martyr Didymus the Soldier, of Alexandria
- Venerable Martyr Ypomoni.
- Venerable Publius of Egypt, monk
- Saints Theonas, Symeon, and Phorbinus, of Egypt
- Venerable Mark the Anchorite of Athens
- Venerable Plato the Confessor, Abbot of the Studion
- Venerable Theodora of Thessaloniki
Pre-Schism Western saints
- Holy Martyrs of North-West Africa, a large group martyred at the Easter liturgy by Genseric, the Arian King of the Vandals
- Saint Bécán, one of the 'Twelve Apostles of Ireland'
- Venerable Derfel-Gadarn, a soldier and afterwards a hermit in Llanderfel in Gwynedd in Wales
- Saint Æthelburh of Kent
Post-Schism Orthodox saints
- Saint Argyre the Neomartyr of Prussa
- New Martyr George of New Ephesus
- New Martyr Panagiotes of Jerusalem
- New Hieromartyr Alexis Krotenkov, Priest
- New Hieromartyr Nicholas Simo, Archpriest, of Kronstadt
Other commemorations
- Translation of the relics of St. Job, Patriarch of Moscow
- Martyrdom of the Optina monastics on Pascha :
- Repose of Righteous Symeon Klimych
- Repose of Elder Philemon of Valaam and Jordanville
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