Painting of Abgar receiving the Image of Edessa from Thaddeus
The upper right panel of this 10th century painting shows Abgar receiving the picture
of Christ--the Image of Edessa--from the
disciple Thaddeus. It is significant in demonstrating that the Legend of
Agbar was current
at this time in the Byzantine world. See: What is the Legend of Abgar?

The above image is from Early Christianity and Culture: The Syriac World and Persia