Today, Stephen Jones is back to working on his dictionary of the shroud. He posts. He is working on G:
Grail, Holy. The "Holy Grail" is a dish, plate, stone, or cup and is part of the Arthurian (King Arthur and the knights of the round table) legendary literature. But historian Daniel Scavone, professor Emeritus of history at the University of Southern Indiana, has shown that the Shroud of Turin is the real object that inspired the Holy Grail legend….
It is an interesting idea. I’ve heard Dan talk about the idea a couple of times. A more recent paper on the subject, Edessan sources for the legend of the Holy Grail is from the Frascati conference in 2010. And here is an interview that Russ Breault conducted with Dan Scavone back in 1999.