October 4 (Eastern Orthodox liturgics)

• Hieromartyr Hierotheus of Athens, first Bishop of Athens (1st century)[1][2][3][4][note 2]
• Venerable Theodore the Wonderworker, Bishop of Tamassos, Cyprus (2nd century)[1][3][5]
• Martyrs Gaius,[6] Faustus,[7] Eusebius,[8] and Chaeremon, Deacons, of Alexandria (3rd century)[1][9][10][note 3] (see also: October 3)
• Martyrs Domnina and her daughters Berenice (Bernice) and Prosdoce, of Syria (302)[1][3][12][13][note 4]
• Martyr Adauctus (c. 312) and his daughter St. Callisthene (c. 318), of Ephesus.[1][3][15][16][note 5]
• Venerable Paul the Simple (c. 339)[18] and Venerable Ammon (350),[3][19][20][21] of Egypt, disciples of St. Anthony the Great.[1][10][22]
• Hieromartyr Peter of Capitolia, Bishop of Bostra in Arabia (715)[1][3][10][22][23][24]
• Venerable John (Lampadistes) of Cyprus (10th century)[1][3][10][25]
• Saint Vladimir Yaroslavich, prince of Novgorod (1052),[22][26] and his mother St. Anna of Novgorod (Ingegerd Olofsdotter of Sweden) (1050)[1][10][27]

• Saint Petronius of Bologna, Bishop of Bologna (c. 450)[28][note 6][note 7]
• Saint Quintius of Tours (Quentin), a citizen of Tours, martyred at L'Indrois near Montrésor (6th century)[28][note 8][note 9]
• Saint Aurea, a Syrian who moved to France and became Abbess of St Martial in Paris, where she remained for thirty-three years (666)[11][28][30]

• Saints Helladius and Onesimus of the Near Caves in Kiev (12th-13th centuries)[1][10][22]
• Saint Ammon, recluse, of the Far Caves in Kiev (13th century)[1][10][22][27][31]
• Saint Stephen Stiljanovic, despot of Srem, Serbia (1540),[22] and his wife St. Elena (Elizabeth in monasticism) (c. 1543)[1][10][32]
• Saints Jonah and Nectarius, monks, of Kazan (16th century)[1][10][33]
• Hieromartyr Evdemoz I, Catholicos of Georgia (1642)[1][10][34]
• Saint Peter (Michurin) of Kuznetsk, Siberia (1820)[1][10]

• Uncovering of the relics (1595) of St. Gurias (1563), first Archbishop of Kazan, and St. Barsanuphius, Bishop of Tver (1576)[1][10][22][39][40]
• Synaxis of the Saints of Kazan.[1][10][22][41][note 10]
• Synaxis of the Saints of Novgorod.[27] (see also: February 10 )
• Synaxis of the Icon of the Theotokos "Kitrinopetritissa" ("Yellow-stone") in Australia.[27]

• 
  Hieromartyr Hierotheus of Athens, first Bishop of Athens.
• 
  Hieromartyr Hierotheus of Athens, first Bishop of Athens.
• 
  Martyrs Gaius, Faustus, Eusebius and Chaeremon, Deacons of Alexandria.
• 
  Martyr Adauctus and his daughter St. Callisthene of Ephesus.
• 
  Venerable Paul the Simple of Egypt.
• 
  Venerable Ammon of Egypt.
• 
  St. Stephen Stiljanovic, of Srem, Serbia.
• 
  Hieromartyr Evdemoz I, Catholicos of Georgia.
• 
  St. Helladius of Kiev.

• October 4/17. Orthodox Calendar (PRAVOSLAVIE.RU).
• October 17 / October 4. HOLY TRINITY RUSSIAN ORTHODOX CHURCH (A parish of the Patriarchate of Moscow).
• October 4. OCA - The Lives of the Saints.
• 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. 74.
• The Fourth Day of the Month of October. Orthodoxy in China.
• October 4. 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. 305–306.
• 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. 474–475.

Greek Sources

• Great Synaxaristes: (in Greek) 4 ΟΚΤΩΒΡΙΟΥ. ΜΕΓΑΣ ΣΥΝΑΞΑΡΙΣΤΗΣ.
• (in Greek) Συναξαριστής. 4 Οκτωβρίου. ECCLESIA.GR. (H ΕΚΚΛΗΣΙΑ ΤΗΣ ΕΛΛΑΔΟΣ).
• (in Greek) 04/10/2016. Ορθόδοξος Συναξαριστής.

Russian Sources

• (in Russian) 17 октября (4 октября). Православная Энциклопедия под редакцией Патриарха Московского и всея Руси Кирилла (электронная версия). (Orthodox Encyclopedia - Pravenc.ru).
• (in Russian) 4 октября по старому стилю / 17 октября по новому стилю. Русская Православная Церковь - Православный церковный календарь на 2016 год.