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.
The 123rd day of the Eastern Orthodox liturgical calendar.
Menaion calendar icon - January.
Circumcision of Christ. Menologion of Basil II.
St. Telemachus (from Foxe's Book of Martyrs, 1563).