Martyr Synesius (Synetus) of Rome, a Reader, tortured and beheaded for refusing to sacrifice to idols (270-275)[3][12][13]
Martyrs Maxentius, Constantius, Crescentius, Justinus and their Companions, martyrs in Trier in Germany in the reign of Diocletian, under the governor Rictiovarus (c. 287)[14][15]
Saint Columba of Terryglass (Columba of Tyrdaglas), born in Leinster in Ireland, he was a disciple of St Finian and Abbot of Tyrdaglas in Munster (552)[14](see also: December 13)
Saint Gregory of Terracina, a disciple of St Benedict, and with his brother St Speciosus, a monk at Terracina in Italy (c. 570)[14]
Saint Cormac (Cormac mac Eogain), an Abbot in Ireland and friend of St Columba (6th century)[14][18]
Saint Agatha, nun at Wimborne in Dorset in England and a disciple of St Lioba, she went to Germany to help St Boniface in his missionary work (c. 790)[14]
Post-Schism Orthodox saints
Saint John, Metropolitan of Zichnon, founder of the Monastery of the Forerunner on Mt. Menikion (north-east of Serres) (1333)[3][19]
Venerable Therapontus, Abbot of Monza (1597)[3][20]
^The notation Old Style or (OS) is sometimes used to indicate a date in the Julian Calendar (which is used by churches on the "Old Calendar"). The notation New Style or (NS), indicates a date in the Revised Julian calendar (which is used by churches on the "New Calendar").
^She in unknown in the Synaxaria. However her memory is recorded in the Jerusalemitic Canonarion pg.120, together with Saint Phoebe, another unknown Saint.
^The life of the holy martyr John, Abbot of Zedazeni Monastery, has not been preserved, but the list recalling “the names of the holy fathers who reposed at Zedazeni Monastery after John of Zedazeni,” which was compiled by Catholicos Arsenius II (955-80), tells us that Abbot John was “murdered at Zedazeni by Muslims.” St. John was martyred in the 9th century.[11]
^Following the advice of her father St Hilary, she consecrated herself to God as a nun but reposed at the age of eighteen.
^"This illustrious Saint of Ireland received his first education in learning and piety from the Bishop St. Fortchern and the Abbot St. Cayman; but he passed over to Wales, and spent many years with St. David at Minevia, blessing that land with the example of his holy life. He was advanced in age when he returned to Ireland, though his zeal for the service of God was in no way diminished. The great work of St. Finian was the foundation of the celebrated School of Clonard, in Westmeath, in which a multitude of eminent servants of God were educated in piety and human learning."[17]
^Archbishop Anatole was glorified as a Russian New-Martyr on the calendars of the Moscow Patriarchate and the Russian Church Abroad and is known as the New Hieromartyr Anatole (Kamensky), Archbishop of Irkutsk. The time and place of Abp. Anatole's death is uncertain. His repose is dated variously as in November 1924 or on September 20, 1925 as well as September 20, 1920 and January 24, 1921. In one account of his death he is recorded as dying quietly in Omsk. He is commemorated on the following feast days:
^The Roman Martyrology. Transl. by the Archbishop of Baltimore. Last Edition, According to the Copy Printed at Rome in 1914. Revised Edition, with the Imprimatur of His Eminence Cardinal Gibbons. Baltimore: John Murphy Company, 1916. p.382.
^Charles-Edwards, T. M. "Connacht, saints of (act. c. 400 – c. 800)". Oxford Dictionary of National Biography (Online ed.), Oxford University Press. First published 2004; Online Edition, Jan 2011.
^ abDecember 25 / December 12. HOLY TRINITY RUSSIAN ORTHODOX CHURCH (A parish of the Patriarchate of Moscow).
^ abThe Autonomous Orthodox Metropolia of Western Europe and the Americas (ROCOR). St. Hilarion Calendar of Saints for the year of our Lord 2004. St. Hilarion Press (Austin, TX). p.93.
The Autonomous Orthodox Metropolia of Western Europe and the Americas (ROCOR). St. Hilarion Calendar of Saints for the year of our Lord 2004. St. Hilarion Press (Austin, TX). p. 93.
December 12. Latin Saints of the Orthodox Patriarchate of Rome.
The Roman Martyrology. Transl. by the Archbishop of Baltimore. Last Edition, According to the Copy Printed at Rome in 1914. Revised Edition, with the Imprimatur of His Eminence Cardinal Gibbons. Baltimore: John Murphy Company, 1916.
(in Greek) Συναξαριστής. 12 Δεκεμβρίου. ECCLESIA.GR. (H ΕΚΚΛΗΣΙΑ ΤΗΣ ΕΛΛΑΔΟΣ).
Russian Sources
(in Russian)25 декабря (12 декабря). Православная Энциклопедия под редакцией Патриарха Московского и всея Руси Кирилла (электронная версия). (Orthodox Encyclopedia - Pravenc.ru).