Orthodox Saints of the Pre-Schism See of Rome
BLADUS, (Date Unknown), St. Bladus is traditionally counted as one of the early bishops of the Isle of Man. Although he was venerated as a saint by his flock shortly after his repose, there is no longer any documentary evidence regarding his life extant.
BYBLIG (BIBLIG, PEBLIG, PIBLIG, PUBLICIUS), (Date Unknown), a holy man honoured in parts of Wales, however there is nothing certain known about him.
DATHUS (DATHIUS, DATUS) of RAVENNA, the eighth Bishop of Ravenna, in the present-day Emilia-Romagna region of Italy. It is said he was elected bishop when a dove miraculously appeared over his head. 190 is given as the year of his repose.
GERMANUS of MAN, not to be confused with his better-known namesake, St. Germanus of Auxerre (31st July), St. Germanus of Man was a monk traditionally counted amongst the nephews of St. Patrick of Ireland (17th March). Though there is no reliable information on his life extant, it is believed that after spending time in monasteries in Ireland, Wales, and Brittany (northern France), he was sent to the Isle of Man as a bishop. He reposed circa 474, and his memory is still kept in the British Isles in several place-names including Germain and Jarman.
GUNTHIERN, a Welsh prince who lived as an anchorite in Brittany (northern France). He reposed circa 500.
GUTHAGON, (Eighth Century), a native of Ireland, possibly a royal, who lived as an anchorite at Oostkerk in Flanders (Belgium).
HELIODORUS of ALTINUM, (Eighth Century), originally from Dalmatia (Croatia), and friend and benefactor of fellow countryman, St. Jerome (30th September). St. Heliodorus, is credited with being especially helpful with the logistics of producing the Vulgate translation of the Bible. He served for a while as Bishop of Altinum, a small town, since destroyed, near Venice (north-eastern Italy). St. Heliodorus is also remembered as a stalwart opponent of Arianism. The exact date of his repose is uncertain, he is recorded as assisting at the first Council of Aquileia in 381, and there is a letter extant from St. Jerome to him dated 396.
IRENAEUS and MUSTIOLA of CHIUSI, St. Irenaeus, was a deacon, and St. Mustiola, a noble lady seemingly related through marriage to Emperor Claudius II(r. 268–270). They were martyred in 273 at Chiusi in Tuscany (central Italy) for ministering to imprisoned Christians, and ensuring proper burials following their martyrdoms.
LEO II, a native of Sicily who was 80th Pope of Rome from 681 until his repose in 683. During his papacy, the former Pope Honorius I (r. 625–638) was censured by the Sixth Œcumenical Council for not denouncing Monothelitism. St. Leo is also credited as the author of several Liturgical Hymns.
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.