Venerable Dionysios of Olympus, founder of the monastery on Mount Olympus.
St. Dionysios was born in Thessaly and became a monk on Mount Athos, where he was abbot of Philotheou. He later withdrew to Mount Olympus in Macedonia and founded there the monastery of the Holy Trinity that bears his name.
He reposed in 1541 and is greatly venerated in Macedonia and Thessaly. He is commemorated on January 23.
Feast day
On the New Calendar, Dionysios of Olympus is commemorated on January 23. Churches on the Old (Julian) Calendar keep the feast on February 5 of the civil calendar.
Also commemorated on January 23

Agathangelos the Martyr
Martyr, Αγαθάγγελος
Holy Martyr Agathangelos, companion of St. Clement of Ankyra.
Name days: Agathangelos, Agathangelus, Agathaggelos
Acholios of Thessaloniki
Hierarch, Αχόλιος
St. Acholios, Bishop of Thessaloniki, who baptized Emperor Theodosios the Great.
Salamanes the Silent
Venerable, Σαλαμάνης ο Ησυχαστής
Venerable Salamanes the Hesychast of the Euphrates.