Gregentios, Bishop of the Himyarites in Arabia and Ethiopia.
Gregentios was a bishop of the sixth century sent to the land of the Himyarites in southern Arabia after the martyrdom of the Christians of Najran. Tradition relates that he restored the churches, gave laws to the Christian kingdom, and held a famous disputation with the Jew Herban. He reposed in peace.
Feast day
On the New Calendar, Gregentios of Ethiopia is commemorated on December 19. Churches on the Old (Julian) Calendar keep the feast on January 1 of the civil calendar.
Also commemorated on December 19

Aglaia of Rome
Holy Woman, Αγλαΐα η Ρωμαία
Righteous Aglaia of Rome, who received the relics of the Martyr Boniface.
Elias, Probus and Ares
Martyr, Ηλίας, Πρόβος και Άρης
Holy Martyrs Elias, Probus and Ares, Egyptians who suffered at Ascalon.
Eutychius, Thessalonica and companions
Martyr, Ευτύχιος, Θεσσαλονίκη και οι συν αυτοίς
Holy Martyrs Eutychius and Thessalonica, with two hundred men and seventy women.
Elias of Murom
Venerable, Ηλιού Μουρόμας
Venerable Elias of Murom, wonderworker of the Kiev Near Caves.