January 10 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 January 10 are broadly the same, no matter which calendar is used..
Afterfeast of the Theophany of Our Lord and Savior Jesus Christ
Blessed Theosebia the Deaconess, sister of Saints Macrina the Younger, Basil the Great, Peter of Sebaste, and Gregory of Nyssa (385)
Saint Gregory, Bishop of Nyssa, Cappadocia (c. 394)
Venerable Ammon, Monk of Nitria in Egypt (5th century)
Saint Marcian the Presbyter of Constantinople (471)
Venerable Domitian (Dometian), Bishop of Melitene and Wonderworker (601)
Saint Pétrone (Petronius), monk at Lérins Abbey, then Bishop of Die in France (463)
Saint Diarmaid the Just (Dermot, Diarmis), spiritual father of St Kieran of Clonmacnois and later founder of a monastery on Innis-Clotran Island, Ireland (6th century)
Saint Tómméne (Thomian, Toimen), Archbishop of Armagh in Ireland (c. 660)
Saint Sæthryth (Sethrid), Abbess (c. 660)
Saint John Camillus the Good, Bishop of Milan, he worked against Arianism and Monothelitism (669)
Saint Agatho, Pope of Rome (681)
Saint Peter Urseolus (Pietro I Orseolo), Doge of Venice, later became a monk at the Monastery of Cuxa in Spain (987)
Venerable Paul, founder and Abbot of Obnora Monastery, Vologda (1429)
Venerable Macarius (Makarios) of Pisemsk, Kostroma, and Obnora Monastery in Vologda, founder and Abbot of Pisma Monastery (15th century)
Venerable Antipas of Calapodesti in Romania, Mount Athos, and Valaam Monastery, Hieroschemamonk (1882)
Venerable Theophan the Recluse, Bishop of Tambov (1894)