Niphon, Bishop of Constantia in Cyprus.
Niphon was born in Paphlagonia and lived a dissolute youth in Constantinople before coming to deep repentance. Tradition relates that he was later made Bishop of Constantia in Cyprus, where he shepherded his flock in humility and reposed in peace in the fourth century.
Feast day
On the New Calendar, Niphon of Constantia is commemorated on December 23. Churches on the Old (Julian) Calendar keep the feast on January 5 of the civil calendar.
Who celebrates a name day
People with these names keep their name day on this feast:
Also commemorated on December 23

Nahum of Ochrid
Venerable, Ναούμ ο Θεοφόρος
Venerable Nahum the God-bearer, Wonderworker of Ochrid, disciple of Saints Cyril and Methodius.
Dedication of Hagia Sophia
Saint, Εγκαίνια της Αγίας Σοφίας
Commemoration of the consecration of the Great Church of Hagia Sophia in Constantinople.