January 1 - Eastern Orthodox liturgical calendar - January 3
Saint Sylvester, Pope of Rome, and the Emperor Constantine the Great.
Adoration of the Cross by Pope St. Sylvester I, Empress Helena and Emperor Constantine.
Martyr Basil of Ancyra (Menologion of Basil II, 10th century).
Relics of Saint Martinianus of Milan, in the Cathedral of Milan.
January 31 - Eastern Orthodox liturgical calendar - February 2
Menaion calendar icon - February.
Meeting of the Lord. Russian Orthodox icon, 15th century
Martyr Tryphon of Campsada.
Martyr Tryphon of Campsada (Menologion of Basil II, 10th century).