In 525 AD, the holy Shroud was discovered hidden above a gate in Edessa's city walls. Six years later, an icon (a religious work of art / painting) was produced at St. Catherine's Monastery in the Sinai. This icon, the Sinai Christ Pantocrator Icon, is defiantly based on the image on the Shroud as can be seen in the following photographs
from: http://www.shroudofturin4journalists.com/pantocrator.htm Similar matching overlay of the Shroud image on Leonardo Da Vinci paintings was the basis of the claim that Da Vinci made the Shroud. The Christ Pantocrator icon, painted in the year 550, also has perfect overlay as shown above. So the argument about the Da Vinci Shroud is not correct. Leonardo Da Vinci must have seen and used the Shroud image as his model.