Venerable Constantine of Synnada, a convert from Judaism.
Venerable Constantine was born to a Jewish family of Synnada in Phrygia in the ninth century and came to faith in Christ, receiving baptism and becoming a monk on Mount Olympus in Bithynia. Tradition relates that he travelled to Cyprus and other places, working miracles, and reposed in peace.
Feast day
On the New Calendar, Constantine the Jew is commemorated on December 26. Churches on the Old (Julian) Calendar keep the feast on January 8 of the civil calendar.
Also commemorated on December 26

Constantius the Russian
Martyr, Κωνστάντιος ο Ρώσος
New Hieromartyr Constantius the Russian of the Great Lavra on Mount Athos.
Nikodemos of Tismana
Venerable, Νικόδημος της Τισμάνα
Venerable Nikodemos the Sanctified of Tismana, founder of monasteries in Romania.