January 13 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
Martyrs Hermylus and Stratonicus at Belgrade (Menologion of Basil II, 10th century)
Martyr Athanasius (Menologion of Basil II, 10th century)
The ordination of St. Hilary of Poitiers (14th century; Vie de saintes)
St. Remigius, Königswinter.
October 13 - Eastern Orthodox liturgical calendar - October 15
January 13 (Eastern Orthodox liturgics)
…Serbian Calendar: Apodosis of the Theophany) Martyr Peter of Anium, at Hieropolis (Peter Apselamus at Eleutheropolis) (c. 309) (see also January 12, and October 14) Martyrs Hermylus (Hermilos) the Deacon and Stratonicus (Stratonikos), at Belgrade (315…
Martyrs Nazarius, Celsius, Gervasius and Protasius, of Milan.
Venerable Parasceva (Petka) of Epibatima Thrace.
St. Burchard of Würzburg, first Bishop of Wurzburg.
St. Cosmas, founder of Yakhromsk Monastery, Vladimir.