August 13 (Eastern Orthodox liturgics)
August 12 - Eastern Orthodox liturgical calendar - August 14
All fixed commemorations below are observed on August 26 by Eastern Orthodox Churches on the Old Calendar.
For August 13, Orthodox Churches on the Old Calendar commemorate the Saints listed on July 31.
Feasts
Apodosis of the Transfiguration of Our Lord, God, and Savior Jesus Christ.Saints
- Martyr Hippolytus of Rome, and 18 martyrs with him, including:
- Martyr Coronatus, by the sword.
- Saint Eudocia the Empress, wife of Theodosius the Younger, in Palestine.
- Venerable Seridus, Abbot, of Gaza Venerable Abba Dorotheus of Gaza
- ''Venerable Dositheos, attendant to Abba Dorotheus of Gaza''
Pre-Schism Western saints
- Saint Pontian, Pope of Rome, was exiled by Emperor Maximinus Thrax to Sardinia in c 235, where he died from ill-treatment
- Saint Cassian of Imola, a martyr who refused to worship idols and suffered a slow death in Imola in Italy
- Saints Centolla and Helen, two virgin-martyrs near Burgos in Spain
- Saint Cassian of Todi, Bishop of Todi, martyred under Maximian Herculeus
- Saint Junian of Mairé, founder of the monastery of Mairé in Poitou in France and later a hermit in Chaulnay
- Saint Radegunde of Poitiers, nun
- Saint Muredach, first Bishop of Killala and founder of Innismurray
- Saint Wigbert, Abbot of Hersfeld, and English missionary to Germany, Confessor
- Saint Herulph, a monk at St Gall in Switzerland, then founded the monastery of Ellwangen near Augsberg in Germany, later became Bishop of Langres in France
- Saint Ludolf, Abbot of New Corvey in Westphalia in Germany from 971 to 983
Post-Schism Orthodox saints
- Empress Irene, wife of Emperor John II Comnenus
- ''Saint Tikhon of Zadonsk, Bishop of Voronezh, Wonderworker of Zadonsk''
New martyrs and confessors
- New Hieromartyrs John Shyshev, Ioasph Panov and Constantine Popov, Priests
- New Hieromartyr Benjamin of Petrograd, Metropolitan, and those with him
- New Hieromartyrs Sergius, Archimandrite, and those with him
- New Hieromartyr Seraphim, Bishop of Dmitrov
- New Hieromartyrs Nicholas Orlov and Jacob Arkhippov, Priests, and Alexis Vedensky, Deacon, of Yarsoslavl-Rostov
- New Martyr Basil Aleksandrin
Other commemorations
Translation of the relics of Venerable Maximus the Confessor- Uncovering of the relics of St. Maximus of Moscow, Fool-for-Christ
- Icons of the Most Holy Theotokos:
- Repose of Valaam Schema-monk Timothy of Mount Athos