17th December (4th December O.S.):
- ADA, a niece of Engebert, Bishop of Le Mans, she became a nun at Soissons and abbess in Le Mans.
- BERTOARA, Abbess of Notre-Dame-de-Sales in Bourges, she reposed in 614.
- FELIX OF BOLOGNA, a deacon with St. Ambrose in Milan (7th December) and later the fifth Bishop of Bologna. He reposed in 429.
* - Prior to the Schism the Patriarchate of Rome was Orthodox and fully in communion with the Orthodox Church. As Saint John of Shanghai and San Francisco +1966 said "The West was Orthodox for a thousand years, and her venerable Liturgy is far older than any of her heresies."