The Shroud of Edessa is the Shroud of Turin. Boniface I of Monferatto embezzled it during the sack of Constantinople and transferred it to his vassal Otto de la Roche who was Duke of Athens. That's how it ended up in the hands of the Templars. After the execution of Geoffroy de Charney together with Grand Master Jaques de Molay in Paris, the cloth came into the hands of his nephew and namesake Geoffroy de Charney and became known as the Shroud of Turin. If this were proven, there would be a war over that garment because Russia, Turkey and Greece would reclaim this relic of the highest class. During the sack of Constantinople, the Pope had also anathematized crusaders who embezzled relics.