Venerable Gregory, founder of the Monastery of Grigoriou on Mount Athos.
Venerable Gregory was a hesychast of the fourteenth century, a disciple of the Sinaite tradition of prayer, who founded the monastery on the south-west coast of Mount Athos that bears his name. He is honoured by the brotherhood of Grigoriou as its founder and heavenly patron.
Feast day
On the New Calendar, Gregory of Grigoriou is commemorated on December 7. Churches on the Old (Julian) Calendar keep the feast on December 20 of the civil calendar.
Also commemorated on December 7

Athenodorus of Mesopotamia
Martyr, Αθηνόδωρος
Holy Martyr Athenodorus of Mesopotamia.
Name days: Athinodoros, Athenodorus
Ammoun of Nitria
Venerable, Αμμούν ο της Νιτρίας
Venerable Ammoun, founder of monastic life in the desert of Nitria.