The thesis of the Sainte-Chapelle has been proposed by André-Marie Dubarle and Hilda Leynen to explain the transfer of the Mandylion from Constantinople to Lirey, which became the Shroud of Turin. It is a very coherent, direct and well documented thesis. The thesis is even more coherent when all the inventories of the relics of the Grande Châsse of the Sainte-Chapelle are carefully analyzed. I have little doubt that it is the correct basis from which we can coherently explain the appearance of the Shroud of Turin in Lirey.

Compared to many other thesis, including the involvement of Othon de la Roche or the Knights Templar, it is a well documented thesis with a direct route from Constantinople to Geoffroy de Charny, who brought the Shroud to Lirey. It is coherent with the statements made by the canons of Lirey as well as the son and granddaughter of Geoffroy de Charny. It also explains in a very simple manner the 153-year silence of the Mandylion that became the Shroud of Turin.

It is even hard to believe that such a coherent thesis has been so unfavorably presented, with so many invalid arguments, since Dubarle and Leynen described it.

You can read the arguments in favor of that thesis by reading a preliminary version of a future paper about that thesis and the inventories of the Grande Châsse of the Sainte-Chapelle.