Venerable Gelasius.
Venerable Gelasius is remembered by the Greek Synaxarion on this day as an ascetic who reposed in peace; the Church also remembers on this day the venerable Gaius.
Feast day
On the New Calendar, Gelasius the Venerable is commemorated on December 31. Churches on the Old (Julian) Calendar keep the feast on January 13 of the civil calendar.
Also commemorated on December 31

Zoticus the Orphan-keeper
Martyr, Ζωτικός ο Ορφανοτρόφος
Holy Martyr Zoticus the Priest, keeper of orphans and lepers in Constantinople.
Theophylact of Ochrid
Hierarch, Θεοφύλακτος Βουλγαρίας
Theophylact of Euripos, Archbishop of Ochrid and All Bulgaria, commentator on the Scriptures.