St. Euthymios, Patriarch of Trnovo, teacher of the Bulgarian people.
St. Euthymios was a disciple of St. Theodosios of Trnovo and lived for a time on Mount Athos before becoming Patriarch of Trnovo in 1375. A learned hesychast, he reformed the Slavonic liturgical books and strengthened his flock during the Ottoman conquest, after which he was exiled.
He reposed around 1402 and is commemorated on January 20.
Feast day
On the New Calendar, Euthymios of Trnovo is commemorated on January 20. Churches on the Old (Julian) Calendar keep the feast on February 2 of the civil calendar.
Also commemorated on January 20

Bassos, Eusebios, Eutychios and Basilides
Martyr, Βάσσος, Ευσέβιος, Ευτύχιος και Βασιλείδης
Holy Martyrs of Nicomedia, senators converted by the martyrdom of St. Theopemptos.
Innas, Pinnas and Rimmas
Martyr, Ιννάς, Πιννάς και Ριμμάς
Holy Martyrs of Scythia, disciples of the Apostle Andrew.
Peter the Publican
Saint, Πέτρος ο Τελώνης
Blessed Peter the Tax-Collector, who was converted through almsgiving.
Leo the Great the Emperor
Saint, Λέων Μακέλλης
Holy Emperor Leo I the Great, called Makelles, of Thrace.