Venerable Thomas Defourkinos of Bithynia.
Venerable Thomas was a monk of Bithynia in the tenth century who lived for many years in solitude near the monastery of Defourkinos. Tradition relates that the emperor Leo the Wise sent him a sealed letter with questions, and that the saint answered them without opening the seal, so great was his gift of discernment.
Feast day
On the New Calendar, Thomas of Bithynia is commemorated on December 10. Churches on the Old (Julian) Calendar keep the feast on December 23 of the civil calendar.
Also commemorated on December 10

Gemellus of Paphlagonia
Martyr, Γέμελλος
Holy Martyr Gemellus of Paphlagonia, crucified under Julian the Apostate.
Theotecnus, Marianus and Eugene
Martyr, Θεότεκνος, Μαριανός και Ευγένιος
Holy Martyrs Theotecnus, Marianus and Eugene.