Orthodox Saints of the Pre-Schism See of Rome
BIRILLUS of CATANIA, he is traditionally considered to have been consecrated first Bishop of Catania in Sicily by the Apostle Peter (29th June) circa 42. St. Birillus is reputed to have been exceptionally successful in his evangelising the local pagans and reposed in extreme old age, circa 90.
ENDA (ENDEUS, ENNA) of ARRAN, the brother of St. Fanchea (1st January), St. Enda founded many of the earliest monasteries in Ireland. His principal monastery was at Killeany in the Arran Islands. SS. Kyran of Clonmacnoise (9th September) and Brendan the Voyager (16th May) were amongst his disciples. St. Enda reposed circa 530.
LUPICINUS of CONDAT, the brother of St. Romanus of Condat (28th February), with whom he founded the Abbey of St. Claude, often called Condat Monastery, in Saint-Claude in the French Jura, and the nearby Laconne Monastery (in the present-day canton of Saint-Lupicin) as well. St. Lupicinus’ sanctity and miracles were attested to in detail by St. Gregory of Tours (17th November) in his writings. St. Lupicinus reposed circa 480.
PHILEMON of ROME and DOMNINUS of ROME, (Date Unknown), Although there are no reliable sources for their Lives extant; they are traditionally believed to have been two Romans who wandered through Italy preaching the Gospel, and were arrested by the Roman authorities who put them to death.
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.