S&V - October 2005 - Page 8
The image of Edessa and the shroud of Turin are indeed presented like one and the same relic by certain "pro-shroud" people, and in particular by Maria Grazia Siliato in her book "Contre-enquête sur le saint suaire" (Ed. Plon). This relic, described like a portrait of Christ, probably existed.

Several old texts (the Doctrine of Addaï, which dates back to the IV century, the History of the image of Edessa, X century, etc.) try to reconstitute its historical course, starting from anecdotes or mentions about a portrait of Christ quoted here and there.

But it is impossible to deduce from these writings that this "divine image" is well the funeral imprint of the Christ, nor it is that which appears in Lirey about 1357. Moreover the image of Edessa is described like reproducing the face of Christ and not his entire body.

VSD - Page 26
Before 1150, we have no certainty, but only more or less probable assumptions. One of them, emitted in 1978 by the British researcher lan Wilson, identifies the shroud of Turin with the mandylion or image of Edessa. It is a veil, carrying the image of the Christ face, who would have appeared at the beginning of the VI century in Edessa, which is currently Urfa, a city of the south-east of Turkey. In 944, the mandylion is transferred in Constantinople.

According to Ian Wilson, the current shroud of Turin and the mandylion would have been one and even object, sometimes exposed in entirety, sometimes folded so as to let see only the face. This assumption was recently consolidated by an optical study of the linen cloth in low-angled light, which highlighted traces of foldings possibly corresponding to the face of the mandylion.