Orthodox Saints of the Pre-Schism See of Rome
27th July
ÆTHERIUS of AUXERRE (ETHERIUS, ETHÈRE), the sixteenth Bishop of Auxerre in Burgundy (France) serving that See from 563 until his repose 573. St. Ætherius promoted the expansion of monasticism in his diocese and safeguarded the Church from meddling by secular authorities.
ECCLESIUS of RAVENNA, the Bishop of Ravenna (northern Italy) from 521 until his repose 532. St. Ecclesius commenced the construction of the Basilica of San Vitale, and also accompanied Pope St. John I (18th May) on his trip to Constantinople on behalf of the Arian Theodoric the Great, King of the Ostrogoths (r. 475–526).
GEORGE, FELIX, AURELIUS, NATALIA, and LILIOSA of CÓRDOBA, a group of Christians martyred in 852 at Córdoba under the Emir Abd ar-Rahman II (r. 822–852). SS. Aurelius and Felix, and their wives, SS. Natalia and Liliosa, were Spaniards. St. George, a Monk-Deacon from the Holy Land, was offered a pardon since he was a foreigner, but chose martyrdom for Christ.
MAURUS, PANTALEIMON, and SERGIUS of BISCEGLIA, St. Maurus, probably a native of Bethlehem, is believed to have been sent by the Apostle Peter (29th June) to be the first Bishop of Bisceglia (southern Italy) on the Adriatic. Imprisoned by order of Emperor Trajan (r. 98–117), he was placed in the custody of SS. Pantaleimon and Sergius whom he converted to Christianity. All three were subsequently martyred circa 117, St. Maurus by beheading, and SS. Pantaleimon and Sergius by crucifixion.
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.