Thaddeus of Edessa

According to Eastern Christian tradition, Thaddeus of Edessa (Syriac: ܡܪܝ ܐܕܝ, Mar Addai or Mor Aday, sometimes Latinized Addeus)[1] was one of the seventy disciples of Jesus. He is possibly identical with Thaddaeus, one of the Twelve Apostles.[2] From an early date his hagiography is filled with legends and fabrications. The saint himself may be entirely fictitious.[3]

Thaddeus of Edessa
Saint Addai ܡܪܝ ܐܕܝ
Icon of St. Thaddeus (10th century, Saint Catherine's Monastery, Mount Sinai)
Bornc. 1st century AD
Diedc. 2nd century AD
Venerated inAssyrian Church of the East
Roman Catholic Church
Chaldean Catholic Church
Syro-Malabar Catholic Church
Syriac Orthodox Church
Eastern Orthodox Church
Oriental Orthodox Church
Church of Caucasian Albania
FeastAugust 5


Based on various Eastern Christian traditions, Thaddaeus was a Jew born in Edessa, at the time a Syrian city, (now in Turkey). He came to Jerusalem for a festival, and heard the preachings of John the Baptist (St. John the Forerunner). After being baptized by John the Baptist in the Jordan River, he remained in Palestine. He later met and became a follower of Jesus. He was chosen to be one of the seventy disciples, whom Jesus sent in pairs to preach in the cities and places.[4]

After Pentecost and the ascension of Jesus, Thaddeus started preaching the gospel in Mesopotamia, Syria and Persia.[4] Thaddaeus ordained priests in Edessa, converted many to Christianity and built up the church there. He also went to Beirut to preach, and founded a church there.[citation needed]

The Syriac liturgy referred to as the Liturgy of Addai and Mari originated around the year 200 AD and is used by the Assyrian Church of the East and the Chaldean Catholic Church (both of which are based in Iraq); it is also used by the Eastern Syriac Churches in India which trace their origins to Thomas the Apostle, namely, the Chaldean Syrian Church and Syro-Malabar Catholic Church .[citation needed]

His feast is celebrated on August 5 in the Christian calendar.[5]

Addai and the healing of King AbgarEdit

Among the Eastern Orthodox faithful, Saint Addai was a disciple of Christ[6] sent by St. Thomas the Apostle to Edessa in order to heal King Abgar V of Osroene, who had fallen ill. He stayed to evangelize, and so converted[7] Abgar—or Agbar, or in one Latin version "Acbar" — and his people including Saint Aggai and Saint Mari.[citation needed]

The story of how King Abgarus V[8][9][10] and Jesus had corresponded was first recounted in the 4th century by the church historian Eusebius of Caesarea.[11] In the origin of the legend, Eusebius had been shown documents purporting to contain the official correspondence that passed between Abgar and Jesus, and he was well enough convinced by their authenticity to quote them extensively in his Ecclesiastical History. According to Eusebius:

Thomas, one of the twelve apostles, under divine impulse sent Thaddeus, who was also numbered among the seventy disciples of Christ, to Edessa, as a preacher and evangelist of the teaching of Christ. (Historia Ecclesiastica, I, xiii)

The story of the healing and Thaddeus' evangelizing efforts resulted in the growing of Christian communities in southern Armenia, northern Mesopotamia and in Syria east of Antioch. Thaddeus' story is embodied in the Syriac document, Doctrine of Addai,[12] which recounts the role of Addai and makes him one of the 72 Apostles sent out to spread the Christian faith.[13] By the time the legend had returned to Syria, the purported site of the miraculous image, it had been embroidered into a tissue of miraculous happenings.[14] The story was retold in elaborated form by Ephrem the Syrian.[citation needed]

Various traditionsEdit

St. Addai also appears in the First Apocalypse of James and the Second Apocalypse of James.[15]

In Roman Catholic tradition, he and Saint Mari are considered patrons of Persian and Assyrian people.[5]


  1. ^ Charles George Herbermann, The Catholic Encyclopedia (Universal Knowledge Foundation, 1913), p. 136.
  2. ^ "Judas, Thaddeus, Addai: possible connections with the vicissitudes of the Edessan and Constantinopolitan Mandylion and any research perspectives". Bari. 4–5 September 2014.
  3. ^ David Wilmshurst, The Martyred Church: A History of the Church of the East (East and West Publishing, 2011), p. 10.
  4. ^ a b "Apostle Thaddeus of the Seventy", Orthodox Church in America
  5. ^ a b "Saint Who? Saints Addai and Mari". Magnificat. Magnificat USA. 20 (12): 76. January 2019.
  6. ^ Sengstock, Mary C. (1982). Chaldean-Americans: Changing Conceptions of Ethnic Identity. Center for Migration Studies. ISBN 9780913256428.
  7. ^ Herbermann, Charles George (1913). The Catholic Encyclopedia. Encyclopedia Press. p. 282.
  8. ^ Bowman, Alan; Garnsey, Peter; Cameron, Averil (2005). The Cambridge Ancient History: Volume 12, The Crisis of Empire, AD 193-337. Cambridge University Press. ISBN 9780521301992.
  9. ^ Skolnik, Fred; Berenbaum, Michael (2007). Encyclopaedia Judaica. Macmillan Reference USA. ISBN 9780028659435.
  10. ^ Roberts, John Morris; Westad, Odd Arne (2013). The History of the World. Oxford University Press. ISBN 9780199936762.
  11. ^ Eusebius, Church History, 1.13 and 3.1
  12. ^ Noegel, Scott B.; Wheeler, Brannon M. (2010-04-01). The A to Z of Prophets in Islam and Judaism. Scarecrow Press. p. 89. ISBN 9781461718956.
  13. ^ Luke 10:1 – 20
  14. ^ Walter Bauer, Orthodoxy and Heresy in Earliest Christianity, 1934, (in English 1971) (On-line text)
  15. ^ Robert Eisenman, James the Brother of Jesus : The key to Unlocking the Secrets of Early Christianity and the Dead Sea Scrolls, 1997 (Viking Penguin). Especially the section "Thaddeus, Judas Thomas and the conversion of the Osrhoeans", pp 189ff.

External linksEdit

Preceded by
Mar Thoma
(c. 34–c. 50)
Catholicus-Patriarch of the East
c. 50–c. 66
Succeeded by
Mar Aggai
(c. 66–c. 81)