Orthodox Saints of the Pre-Schism See of Rome
ADRIAN and COMPANIONS, St. Adrian was a bishop (perhaps of St. Andrews) on the Isle of May in the Firth of Forth in Scotland, who, along with a group of martyrs (which some sources number in the thousands), was massacred by the Danes in 874. There is no further reliable information on this saint’s life available to us.
APPIAN, a monk at the Abbey of St. Peter of Ciel d'Oro in Pavia, where he served as Steward. He later became a hermit in Commacchio in present-day Emilia Romagna Italy. St. Appian evangelised the area around Commacchio. He reposed circa 800.
BASINUS, a seventh century Abbot of St. Maximin’s Abbey in Trier in the present-day German state of Rhineland-Palatinate. St. Basinus was consecrated thirty-fourth Bishop of Trier circa 671, and served that See until his repose circa 705.
FLIX of RHUYS, a hermit on Ouessant Island off the coast of Brittany. St. Felix later became a monk at the Abbey of St. Benedict on the Loire (abbaye de Saint-Benoît-sur-Loire — Fleury Abbey). St. Felix was given the obedience of restoring the Abbey of St. Gildas of Rhuys which had been razed by the Vikings. St. Felix reposed in 1038.
LEONARD of AVRANCHES, as a youth, St. Leonard was bully with a volatile temper. As an adult, he repented and in time was elected Bishop of Avranches. St. Leonard served that See for thirty years, reposing circa 614.
LUCIUS I, elected the twenty-second Pope of Rome in 253, and briefly exiled by the Emperor Trebonianus Gallus (r. 251–253). St. Lucius is remembered for condemning the Novatian Schism. He reposed in 254 after only 253 days as Pope.
MARTYRS of ROME, a group of nine hundred martyrs (circa 260) buried in the catacombs of Callistus on the Appian Way. Nothing further is known of their lives or martyrdom.
OWEN (OWIN), a monk who accompanied St. Ceadda (Chad) of Lichfield (2nd March) on his mission to the Mercians, St. Owen then served him at Lichfield. Though no Life is extant, tradition has it that he led a most holy life, and by God’s Grace, had many heavenly visions. St. Owen reposed circa 680.
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.