February 4 (Eastern Orthodox liturgics)

• Afterfeast of the Meeting of our Lord in the Temple.[1]

• Martyrs Jadorus and Isidore, who suffered under Decius (3rd century)[2][3][4]
• Hieromartyr Phileas, Bishop of Thmuis, and Martyr Philoromus the Magistrate (c. 303)[2][4][5][note 2]
• Martyr Theoctistus, by the sword.[7][8]
• Venerable John of Irenopolis, Bishop of Irenopolis, Cilicia and one of the 318 fathers of Nicaea (c. 325)[2][4][8][9]
• Hieromartyr Abramius of Arbela, Bishop of Arbela in Assyria (c. 344–347)[2][8][10][11]
• Venerable Isidore of Pelusium (c. 436–440)[2][6][8][12][13][14][note 3]
• Saint Evagrius, fellow-ascetic of St. Shio of Mgvime, Georgia (6th century)[2][4][15][16]
• Venerable Nicetas of Pythiae (modern Kouri) (pre-iconoclasm)[8][17]
• Venerable Iasimos the Wonderworker (Jasim), monk and healer.[8][18]
• Venerable Nicholas the Confessor, Abbot, of the Studion Monastery (868)[2][8][19][20][21]

• Martyrs Aquilinus, Geminus, Gelasius, Magnus and Donatus, martyrs in 'Forum Sempronii', which has been interpreted as Fossombrone in central Italy (3rd century)[6][22][note 4]
• Martyr Eutychius, in Rome under Diocletian (4th century)[22][note 5][note 6]
• Saint Aventinus of Chartres, Bishop of Chartres (c. 520)[22][23]
• Saint Aventinus of Troyes, an almoner to St Lupus, Bishop of Troyes, then became a hermit at Saint-Aventin (c. 538)[6][22][24]
• Saint Vincent of Troyes, Bishop of Troyes (c. 546)[22]
• Hieromartyr Aldate of Gloucester (6th century)[2][4][22][note 7][note 8]
• Saint Modan, Abbot of Stirling and Falkirk (6th century)[4][22][26][note 9][note 10]
• Saint Liephard, a bishop and companion of King Cædwalla of Wessex during the latter's pilgrimage to Rome, martyred near Cambrai in France (690)[22][note 11]
• Saint Vulgis, Bishop and Abbot of Lobbes Abbey in Belgium (c. 760)[22]
• Saint Nithard, a monk at Corbie Abbey in Saxony in Germany and a companion of St Ansgar, whom he followed to Sweden as a missionary, martyred there by pagan Swedes (845)[22]
• Saint Rabanus Maurus, archbishop of Mainz (856)[28]
• Saint Rembert, Bishop of Hamburg-Bremen (865)[6][22][29][note 12]

• Right-Believing George Vsievolodovich of Vladimir, Great Prince of Vladimir (1238)[2][4][30][31]
• Venerable Abraham and Coprius, founders of Pechenga Monastery in Vologda (15th century)[2][4][32][33]
• Venerable Cyril, Abbot and Wonderworker of New Lake Monastery (Novoezersk) in Novgorod (1532)[2][34][35][note 13] (see also November 7)
• New Martyr Joseph of Aleppo in Syria (1686)[2]

• Repose of the royal recluse Nun Dosithea of Moscow (1810)[2][46]

• 
  Venerable Isidore of Pelusium.
• 
  Venerable Nicholas the Confessor, Abbot, of the Studion Monastery.
• 
  Venerable Cyril of Novoezersk.
• 
  New Hieromartyr Methodius (Krasnoperov), Bishop of Petropavlovsk.
• 
  Virgin-martyr Ekaterina Dekalina.

• February 4 / 17. Orthodox Calendar (Pravoslavie.ru).
• February 17 / 4. Holy Trinity Russian Orthodox Church (A parish of the Patriarchate of Moscow).
• February 4. 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. 12.
• The Fourth Day of the Month of February. Orthodoxy in China.
• February 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. 37–38.
• 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. 51–54.

Greek Sources

• Great Synaxaristes: (in Greek) 4 Φεβρουαρίου. Μεγασ Συναξαριστησ.
• (in Greek) Συναξαριστής. 4 Φεβρουαρίου. Ecclesia.gr. (H Εκκλησια Τησ Ελλαδοσ).

Russian Sources

• (in Russian) 17 февраля (4 февраля). Православная Энциклопедия под редакцией Патриарха Московского и всея Руси Кирилла (электронная версия). (Orthodox Encyclopedia - Pravenc.ru).
• (in Russian) 4 февраля по старому стилю / 17 февраля по новому стилю. Русская Православная Церковь - Православный церковный календарь на 2018 год.