Orthodox Saints of the Pre-Schism See of Rome
16th December
ADELAIDE (ADELHEID), a Burgundian princess wed to King Lothaire of Italy. Following the death of Lothaire, St. Adelaide married Otto I, Holy Roman Emperor, who also predeceased her. As Dowager Empress, she served as regent for the child Otto III, and was of great service to both Church and State. Towards the end of her life St. Adelaide retired to a monastery in Alsace, where she reposed in 999.
ADO, a Burgundian noble who was educated, then received monastic tonsure at the Abbey of Saint Peter and Saint Paul of Ferrières, in present-day Ferrières-en-Gâtinais, Loire, France. He was given the obedience of teaching at Prüm Abbey in Lorraine. After leaving Prüm, St. Ado spent several years in Rome and Ravenna, during which time he published a Roman Martyrology. In 859 St. Ado was consecrated fifty-second Bishop of Vienne, serving that See until he reposed in 875.
BEOC (BEANUS, DABEOC, MOBEOC), (Fifth or Sixth Century), information on his life is rather vague, but according to tradition he was a disciple of St. Patrick (17th March) who was placed in charge of St. Patrick's Purgatory, an ancient pilgrimage site on Station Island in Lough Derg, where he also founded a monastery.
MARTYRS of NORTH-WEST AFRICA, a group of women probably numbering one or two hundred martyred during the persecutions under the Arian Huneric, King of the Vandals (r. 477–484) in 482.
MARTYRS of RAVENNA (VALENTINE, CONCORDIUS, NAVALIS and AGRICOLA), (Early Third Century), a group of martyrs at Ravenna, of whom nothing further is known than these four names.
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”.
Details of British Saints excerpted from Orthodox Saints of the British Isles.
Details of continental saints from these sources.
In many cases there are several spelling versions of the names of saints from the British Isles. I use the Oxford Dictionary of National Biography version as the primary version with the more prevalent version in parenthesis e.g. Ceadda (Chad) of Lichfield.