January 20 (Eastern Orthodox liturgics)

• Martyrs Inna, Pinna, and Rimma (1st-2nd century), disciples of the Apostle Andrew in Scythia[1][2][3]
• Martyr Eusebius (298)[4][note 2]
• Venerable Euthymius the Great (473)[1][5][6]
• Martyrs Bassus, Eusebius, Eutychius, and Basilides, at Nicomedia (303)[1][7][8][9]
• Martyrs Thyrsus and Agnes (5th century)[10][11][note 3]
• Saint Leo, Confessor and Emperor of the Eastern Roman Empire (474)[11][12][note 4]
• Saint Peter the Customs Inspector of Constantinople (Peter of Constantinople) (c. 527-565)[1][11][13]

• Martyr Anna at Rome[11][14]
• Saint Fabian, Pope of Rome (250)[15][note 5]
• Saint Sebastian, one of the most renowned of all the martyrs of Rome (c. 288)[15][note 6]
• Saint Molagga (Molacus, Laicin), disciple of St David in Wales, founded a monastery in Fulachmhin (Fermoy), Ireland (655)[15]
• Saint Féchín (Fechinus), founded Fore Abbey at Meath (665)[15][note 7]
• Saint Maurus, monk and Abbot of Classe in Ravenna (Basilica of Sant'Apollinare in Classe), and finally Bishop of Cesena (946).[15]

• Venerable Laurence the Recluse (13th-14th century) of the Kiev Caves[1][16][17]
• Venerable Euthymius the Silent, Schemamonk (14th century), of the Kiev Caves[1][16][18]
• Saint Neophytus of Vatopedi monastery, Mt. Athos (14th century)[1][11][19](see also: January 21)
• Saint Euthymius, Patriarch of Turnovo (1402)[1][20]
• Saint Euthymius of Syanzhema (Vologda) (1470)[1][19][21]
• Venerable Euthymius of Arkhangelsk (1523)[1][11][22]
• New Martyr Zachariah of Patrai in Morea (1782)[1][23][24]
• Venerable Theodore Kuzmich of Tomsk (1864)[1][11][25]

• Repose of Elder Gerasim, founder of Ascension Monastery, Irkutsk (1676)[1]

• 
  Martyrs Inna, Pinna, and Rimma
  (Menologion of Basil II)
• 
  Venerable Euthymius the Great.
• 
  Martyrs Bassus, Eusebius, Eutychius, and Basilides
  (Menologion of Basil II)
• 
  Imperial portrait of St Leo.
• 
  Saint Fabian, Pope of Rome.
• 
  Martyrdom of St Sebastian.
• 
  Saint Agatho, Pope of Rome
  (Menologion of Basil II)
• 
  Venerable Theodore Kuzmich of Tomsk.

• January 20 / February 2. Orthodox Calendar (PRAVOSLAVIE.RU).
• February 2 / January 20. HOLY TRINITY RUSSIAN ORTHODOX CHURCH (A parish of the Patriarchate of Moscow).
• January 20. 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. 9.
• January 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. 20–21.

Greek Sources

• Great Synaxaristes: (in Greek) 20 ΙΑΝΟΥΑΡΙΟΥ. ΜΕΓΑΣ ΣΥΝΑΞΑΡΙΣΤΗΣ.
• (in Greek) Συναξαριστής. 20 Ιανουαρίου. ECCLESIA.GR. (H ΕΚΚΛΗΣΙΑ ΤΗΣ ΕΛΛΑΔΟΣ).

Russian Sources

• (in Russian) 2 февраля (20 января). Православная Энциклопедия под редакцией Патриарха Московского и всея Руси Кирилла (электронная версия). (Orthodox Encyclopedia - Pravenc.ru).
• (in Russian) 20 января (ст.ст.) 2 февраля 2013 (нов. ст.). Русская Православная Церковь Отдел внешних церковных связей. (DECR).