According to [[Eusebius]], King Abgar of Edessa was afflicted of an illness, and hearing of the miracles of Jesus as a healer he sent a letter to Him, asking if He would come to his aid. Jesus responded that He could not come, but would send his disciple Thaddeus, who comes and heals him;<ref>http://www.ccel.org/ccel/schaff/npnf201.iii.vi.xiii.html</ref> according to variants of this story King Abgar is left with the cloth image of Jesus, beginning with the ''Doctrine of Addai'' (ca. 400 A.D.) in which a court painter created an image of the Lord and "brought with him to Abgar the king, his master. And when Abgar the king saw the likeness, he received it with great joy, and placed it with great honor in one of his palatial houses."<ref>http://www.tertullian.org/fathers/addai_2_text.htm</ref> Artistic works of this relic - called either the "Image of Edessa" or the "[[Mandylion]]" - generally have it portrayed as the face of Christ upon a towel or kerchief.
The Mandylion would surface again around 525 when Edessa was flooded by the Daisan River. Workmen repairing one of the city's gates discovered a niche with the cloth inside; the mandylion was declared to be ''Acheiropoietos'' (Greek: Αχειροποίητος), "not made by hands", meaning that it was a miraculous image created supernaturally and not by man. The Mandylion stayed in Edessa as a means of protection for the city from harm until forcibly taken to [[Constantinople]] in 944, where it was received with great fanfare by Emperor Romanus I. Placed within the church of Saint Mary of Blachernae, it stayed there as a Christian relic until disappearing in the sack of the city during the [[Fourth Crusade ]] in 1204. One of the knights who participated in the sacking of Constantinople, Robert de Clari, left a detailed letter of what he observed at the time, and he referred to this relic as being more than a facial image:
:''"But among the rest, there was also another of the minsters, which was called the Church of my Lady Saint Mary of Blachernae, within which was the shroud wherein Our Lord was wrapped. And on every Friday that shroud did raise itself upright, so that the form of Our Lord could clearly be seen. And none knows - neither Greek nor Frank - what became of that shroud when the city was taken."''<ref>http://www.deremilitari.org/resources/sources/clari4.htm</ref>