Orthodox Saints of the Pre-Schism See of Rome
18th September
EUSTORGIUS of MILAN, a native of Greece traditionally believed to have been an official of Emperor St. Constantine the Great, elected Bishop of Milan in 315 as successor to either St. Maternus of Milan (18th July), or perhaps St. Mirocles of Milan (3rd December). From a letter of St. Athanasius the Great we learn that St. Eustorgius seems to have to have suffered for the Faith, and to have written in defence of orthodoxy against the Arians. St. Eustorgius is also credited with the acquisition of the relics of the Three Magi, which were later transported to Cologne in the present-day German state of North Rhine-Westphalia by Frederick I Barbarossa, King of Germany (r. 1152–1190) and Holy Roman Emperor (r. 1155–1190). St. Eustorgius reposed in 331.
FERREOLUS the TRIBUNE, an illustrious Martyr of Vienne (south-eastern France); St. Ferreolus was an officer in the Imperial Roman army, who when in 304 was discovered to be a Christian, was brought to trial, scourged, and in the end beheaded.
FERRÉOL (FERREOLUS) of LIMOGES, Bishop of Limoges from 579 until his repose in 591. While Bishop, St. Ferreolus assisted at the third Synod of Macôn which was held in 585.
RICHARDIS of ANDLAU, the wife of Charles III (the Fat) Holy Roman Emperor (r. 881–887) and foundress of Andlau Abbey (abbaye d'Andlau) at Andlau (Alsace, eastern France). St. Richardis was well-known for her holiness of life. Charles’ increasing madness coupled with a bid to oust his despised Archchancellor Liutward, led Charles to accuse St. Richardis of adultery with Liutward. Despite repeated denials and even submitting to ordeal by fire, Charles continued his accusations, so St. Richardis withdrew to Andlau and received monastic tonsure. In time she succeeded her niece Rotrod as abbess. St. Richardis reposed between 894 and 896, at Andlau and was buried there.
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.