Venerable Theodosius of Trnovo, disciple of Gregory of Sinai and teacher of hesychasm in Bulgaria.
Saint Theodosius was a Bulgarian monk who became a disciple of Saint Gregory of Sinai at Paroria and later founded the monastery of Kilifarevo near Trnovo, which became a centre of hesychast spirituality and learning. He defended Orthodoxy against heresies at councils in Trnovo.
He reposed in Constantinople in 1363.
Feast day
On the New Calendar, Theodosius of Trnovo is commemorated on November 27. Churches on the Old (Julian) Calendar keep the feast on December 10 of the civil calendar.
Also commemorated on November 27

Pinouphrios the Venerable
Venerable, Πινούφριος
Venerable Pinouphrios of Egypt, the abbot who fled honour to live as an unknown novice.
Nathanael the Venerable
Venerable, Ναθαναήλ ο Όσιος
Venerable Nathanael of Nitria, who did not leave his cell for many years.
Gregory of Sinai
Venerable, Γρηγόριος ο Σιναΐτης
Venerable Gregory of Sinai, teacher of hesychast prayer on Athos and in Bulgaria.
Damaskenos the Studite
Hierarch, Δαμασκηνός ο Στουδίτης
Saint Damaskenos the Studite, Bishop of Liti and Rentini, author of the Thesauros.