Venerable Ioannis the Palaiolavritis ("of the Old Lavra"), at St. Chariton's Monastery, in the Judean Desert.[3][18] (see also: April 19)
Pre-Schism Western saints
Martyrs Sulpicius and Servilian, martyrs in Rome who were beheaded under Trajan (c. 117)[19][note 7]
Saints Marcellinus of Embrun,[20] Vincent and Domninus, born in North Africa, they went to France and preached in the Dauphiné (c. 374)[19][note 8][note 9]
^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").
^"The same day, the holy martyrs Victor, Zoticus, Zeno, Acindinus, Caesareus, Severian, Chrysophorus, Theonas, and Antoninus, who suffered martyrdom after undergoing various trials."[7]
^"The same day, St. Theodore, confessor, surnamed Trichinas, from the rough hair garment which he wore. He was renowned for many miracles, but especially for his power over the demons. From his body issues a liquid which imparts health to the sick."[7]
^"At Tomis, in Scythia, St. Theotimus, bishop, whose great sanctity and miracles procured him the veneration of unbelieving barbarians."[7]
^"Sainted Anastasias II, Patriarch of Antioch, entered upon the throne after the holy Patriarch Anastasias I the Sinaite (561-572; 593-599). He governed the Church for 10 years and was killed in 609 by Jews, – when emperor Phocas (602-610) issued an edict, forcing all to accept baptism."[16]
^"AT Rome, the holy martyrs Sulpicius and Servilian, who were converted to the faith of Christ by the discourses and the miracles of the holy virgin Domitilla. Having refused to sacrifice to the idols, they were beheaded by Anian, prefect of the city, in the persecution of Trajan."[7]
^Born in North Africa, they went to France and preached in the Dauphiné. St Marcellinus was consecrated first Bishop of Embrun by St Eusebius of Vercelli. The relics of the three saints are venerated in Digne in the Alps.
^"At Embrun, in France, St. Marcellin, first bishop of that city, who by divine inspiration came from Africa with his holy companions Vincent and Domninus, and converted to the faith of Christ the greatest portion of the inhabitants of the maritime Alps, by his preaching and the wonderful prodigies, which he still continues to work."[7]
^A King of Wessex in England, he was a cruel and cunning pagan. He was converted and went to Rome, where he was baptised by Pope Sergius and died in the white robe of baptism.
^He married St Bertha of Val d'Or and was the brother of St Nivard. He separated from his wife, became a monk, went to Ireland and was martyred there by heathen.
^Born in Poitiers in France, he became a monk at Saint Savin. Later he restored monastic life in several monasteries. He reposed at Anzy-le-Duc.
^See: (in Russian) Александро-Ошевенский монастырь. Википедии. (Russian Wikipedia).
^See: (in Russian) Феодосий (Ганицкий). Википедии. (Russian Wikipedia).
^"The Cypriot Icon of the Mother of God appeared in the year 392 on the island of Cyprus and was situated in a monastery built on the place of its appearance. The celebration of this icon is done also on 9 July and on the day of the Descent of the Holy Spirit upon the apostles."[29]
^Rev. Sabine Baring-Gould (M.A.). "SS. Victor, Zoticus and Companions, MM. (A.D. 303.) (A.D. 303.)." In: The Lives of the Saints. Volume the Fourth: April. London: John C. Nimmo, 1897. p. 250.
^ a b c d e fThe 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. pp. 110-111.
^St Theotimus the Bishop of Lesser Scythia. OCA - Lives of the Saints.
^Rev. Sabine Baring-Gould (M.A.). "S. Theotimus, B. of Tomi. (Beginning of 5th Cent.)." In: The Lives of the Saints. Volume the Fourth: April. London: John C. Nimmo, 1897. p. 251.
^ a b c d e f g(in Russian) 20 апреля (ст.ст.) 3 мая 2013 (нов. ст.). Русская Православная Церковь Отдел внешних церковных связей.
^ a b c d e f gApril 20. Latin Saints of the Orthodox Patriarchate of Rome.
^Rev. Sabine Baring-Gould (M.A.). "S. Marcellinus, B. of Embrun. (4th Cent.)." In: The Lives of the Saints. Volume the Fourth: April. London: John C. Nimmo, 1897. p. 251.
^Rev. Richard Stanton. A Menology of England and Wales, or, Brief Memorials of the Ancient British and English Saints Arranged According to the Calendar, Together with the Martyrs of the 16th and 17th Centuries. London: Burns & Oates, 1892. pp. 168-169.
^Childmartyr Gabriel of Bialystok. OCA - Lives of the Saints.
^The Cypriot Icon of the Mother of God. Holy Trinity Russian Orthodox Church (A parish of the Patriarchate of Moscow).
^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). p. 30.
April 20 / May 3. Orthodox Calendar (pravoslavie.ru).
May 3 / April 20. Holy Trinity Russian Orthodox Church (A parish of the Patriarchate of Moscow).
April 20. OCA - The Lives of the Saints.
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). p. 30.
April 20. 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. pp. 110–111.
Rev. Richard Stanton. A Menology of England and Wales, or, Brief Memorials of the Ancient British and English Saints Arranged According to the Calendar, Together with the Martyrs of the 16th and 17th Centuries. London: Burns & Oates, 1892. pp. 168–173.
Greek Sources
Great Synaxaristes: (in Greek) 20 Απριλίου. Μεγασ Συναξαριστησ.
(in Greek) Συναξαριστής. 20 Απριλίου. ecclesia.gr. (H Εκκλησια Τησ Ελλαδοσ).
Russian Sources
(in Russian) 3 мая (20 апреля). Православная Энциклопедия под редакцией Патриарха Московского и всея Руси Кирилла (электронная версия). (Orthodox Encyclopedia - Pravenc.ru).
(in Russian) 20 апреля (ст.ст.) 3 мая 2013 (нов. ст.). Русская Православная Церковь Отдел внешних церковных связей.