Venerable Marcellus, Abbot of the Monastery of the Unsleeping Ones.
Venerable Marcellus was born in Apamea in Syria in the fifth century and became a monk of the monastery of the Akoimetoi, the Unsleeping Ones, near Constantinople, where the praise of God was sung without ceasing day and night. Chosen abbot, he governed the brotherhood with wisdom and took part in the struggles of the Church for the Orthodox faith. He reposed in peace.
Feast day
On the New Calendar, Marcellus of the Unsleeping Ones is commemorated on December 29. Churches on the Old (Julian) Calendar keep the feast on January 11 of the civil calendar.
Who celebrates a name day
People with these names keep their name day on this feast:
Markellos, Marcellus, Marcello
Also commemorated on December 29

Thaddeus of Studion
Venerable, Θαδδαίος ο Ομολογητής
Venerable Thaddeus the Confessor of the Monastery of Studion.
All Christians Martyred by Hunger, Cold and the Sword
Saint, Πάντες οι Χριστιανοί οι μαρτυρικώς τελειωθέντες
Commemoration of all Orthodox Christians who died as martyrs for Christ by hunger, thirst, cold and the sword.