^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").
^Terence, Africanus, Pompeius and Companions: A group of fifty martyrs, imprisoned with snakes and scorpions and finally beheaded in Carthage in North Africa under Decius.[5]
^A number of criminals baptised by Pope Alexander during his imprisonment. They were taken to Ostia near Rome and put on board a boat which was then scuttled.
^"At Rome, the birthday of many holy martyrs, whom pope St. Alexander baptized whilst he was detained in prison. The prefect Aurelian had them all put in an old ship, taken to the deep sea, and plunged into it with stones tied to their necks."[9]
^In their onslaught on England, the Danes attacked monasteries in particular. They martyred Sts Beocca, Abbot, Ethor, monk-priest and some ninety monks at Chertsey in Surrey; at Peterborough they martyred St Hedda, Abbot, and others at his monastery; at Thorney, St Torthred and others.[5]
^Born in Antioch, he was a bishop who travelled westwards as a pilgrim and was received by monks at the monastery of St Bavo in Ghent in Belgium.
^The Monastery lies on the eastern slope of Penteli, on the road to Rafina-Pikermi, near a ravine. It is a monastic complex consisting of the katholikon, the cells, the Refectory, a fountain and a Byzantine defense tower in the entrance gate. The Monastery was destroyed in the end of the 17th century by Algerian pirates’ raids, who slaughtered the monks, whose heads and relics are displayed in a building of the monastic complex.[18]
^"The holy patriarch-martyr was hanged over the door to the Phanarion and later his body was thrown into the Bosphoros. Ukrainian sailors retrieved his body, thinking him to have been a priest martyred by the Turks. At Odesa, he was positively identified as the patriarch and enshrined there until his glorification as a sainted hieromartyr and return to Athens where he is now enshrined. The Ukrainian Orthodox Church has placed his name in its own calendar, especially owing to his great veneration by Ukrainians. The translation of his relics took place on 25/4/1871."[23]
^On the occasion of the two hundred years since the martyrdom of Patriarch Gregory I on 10 April 1821, with the recommendation of the Accompanying Committee on Legal and Doctrinal Issues, and on the proposals of the Most Reverend Metropolitans Chrysostomos of Patras, Theophilos of Lefkados and Ithaca, and Markos of Chios, Psara and Oinousses, the Permanent Holy Synod of the Church of Greece decided to inscribe in the hagiological lists of the church seven other hierarchs who were arrested together with Patriarch Gregory V on the same day, and were subsequently hanged, confessing the faith.[24][25]
^ abThe 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. 101.
^ abcApril 23 / April 10. Holy Trinity Russian Orthodox Church (A parish of the Patriarchate of Moscow).
^Rev. Sabine Baring-Gould (M.A.). "S. Macarius of Antioch, B. (A.D. 1012.)." In: The Lives of the Saints. Volume the Fourth: April. London: John C. Nimmo, 1897. pp. 133-135.
The Autonomous Orthodox Metropolia of Western Europe and the Americas. St. Hilarion Calendar of Saints for the year of our Lord 2004. St. Hilarion Press (Austin, TX). pp. 27–28.
April 10. 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. p. 101.
(in Greek) Συναξαριστής. 10 Απριλίου. ecclesia.gr. (H Εκκλησια Τησ Ελλαδοσ).
Russian Sources
(in Russian)23 апреля (10 апреля). Православная Энциклопедия под редакцией Патриарха Московского и всея Руси Кирилла (электронная версия). (Orthodox Encyclopedia - Pravenc.ru).