Based on various Eastern Christian traditions,[3] Addai was a Jew born in Edessa (now Şanlıurfa, Turkey). He came to Jerusalem for a festival where he heard the preaching of John the Baptist (St. John the Forerunner). After being baptized in the Jordan River, he remained in Judea and became a follower of Jesus. He was chosen as one of the seventy disciples sent in pairs to preach in the cities and places.[4]
After Pentecost and the ascension of Jesus, Addai started preaching the gospel in Mesopotamia, Syria and Persia.[4] He ordained priests in Edessa, converted many to Christianity and built up the church there. He also went to Beirut to preach, and many believe that he founded a church there.[5]
The story of how King Abgarus V[10][11][12] and Jesus had corresponded was first recounted in the 4th century by the church historian Eusebius of Caesarea.[13] 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 Addai's 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,[14] which recounts the role of Addai and makes him one of the 72 Apostles sent out to spread the Christian faith.[15] 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.[16]
^Neale, John Mason (2008). A History of the Holy Eastern Church: The Patriarchate of Antioch: The Patriarchate of Antioch. Wipf and Stock Publishers. p. 38. ISBN978-1-60608-330-7.
^Walter Bauer, Orthodoxy and Heresy in Earliest Christianity, 1934, (in English 1971) (On-line text)
^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.