Orthodox Saints of the Pre-Schism See of Rome
DOMITIAN of HUY, often referred to as the “Apostle of the Meuse Valley” (present-day Belgium) in recognition of his efforts there to bring people to Christ. St. Domitian served as the second Bishop of the Diocese of Tongeren and Maastricht. He was a great foe of heresy, which he forcefully spoke out against at the Fifth Council of Orléans in 549; which amongst other things, anathematised Nestorius and Eutyches. St. Domitian reposed 560, and his relics were enshrined at Huy in present-day Belgium.
JOHN of BEVERLEY, our father among the saints John of Beverley was a diligent scholar and teacher who was educated at St. Augustine's monastery at Canterbury (England) under the supervision of St. Theodore of Canterbury (19th September). St. John then went to the double monastery of Whitby Abbey under St. Hilda (17th November). At Whitby, his students included St. Bede the Venerable (25th May), whom St. John ordained to the priesthood. St. Bede the Venerable relates in his Historia Ecclesiastica how St. John cured a deaf mute through his blessing. St. John was first consecrated Bishop of Hexham (England) circa 687, and was translated to Diocese of York (England) in 705. However, he resigned that See after eight years, and retired to the abbey at Inderawood (present-day Beverley, East Riding of Yorkshire, England) which he had founded. St. John reposed there in 721.
JUVENAL of BENEVENTO, however improbable, some say he was deacon to Pope Saint Alexander I (3rd May), whilst more likely is the opinion that St. Juvenal was a Bishop of Teramo in the Abruzzo (Italy). He is thought to have reposed circa 132, and his reputed relics are enshrined at Benevento, Campania, Italy.
PETER of PAVIA, the twelfth Bishop of Pavia in Lombardy (Italy) during the reign of his nephew Liutprand, King of the Lombards (r. 712–744). St. Peter reposed circa 735.
PLACID (PLACIDUS, PLAIT), an abbot of the Abbey of St. Symphorian (abbaye Saint-Symphorien d'Autun) in Autun, Burgundy (France). St. Placid reposed circa 675.
SERENICUS and SERENUS, two noblemen originally from Spoleto in Italy who became hermits near the River Sarthe in Gaul (France). St. Serenicus later served as Abbot of a local monastery, while St. Serenus remained a hermit until his repose. They are believed to have reposed circa 669.
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.