Orthodox Saints of the Pre-Schism See of Rome
DATIUS (DACIUS) , consecrated the twenty-seventh Bishop of Milan circa 530, St. Datius was forced to flee to Constantinople after Milan was overrun by Arian Ostrogoths. He spent the rest of his life in exile in Constantinople defending orthodoxy from the heresies of the day, especially Arianism. St. Datius reposed in 552.
EUPHRASIUS, (Date Unknown), a bishop of an unknown see, martyred by Arian Vandals in North Africa. No further details of his life are extant.
FELIX of NOLA, the elder son of Hermias, a Syrian soldier who had retired to Nola near Naples. Upon the death of his father, St. Felix sold his possessions, giving the proceeds to the poor and sought ordination to the priesthood. Having been priested by St. Maximus of Nola (15th January), St. Felix dedicated himself to service of his bishop. During the Decian Persecution (250–251) St. Felix was arrested and tortured while St. Maximus fled to the mountains, but according to legend, an angel freed St. Felix so he could care for the ill St. Maximus. St. Felix successfully hid himself and his bishop until the end of the persecution. Upon the repose of St. Maximus, St. Felix was chosen his successor, however, he demurred, recommending a priest who had been ordained seven days before him as having more experience. St. Felix retired to farm, providing food for the poor and reposed circa 255. Because of the torture and imprisonment he experienced during the Decian Persecution St. Felix is often listed in martyrologies and calendars as a martyr.
FELIX of ROME, (Date Unknown), a priest in Rome, of whom no further information is extant.
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”.
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.