Jacob's Secret Shame
...sir Gallous, who was also called Jacob the Fair was rumored to have been one of the knights who sought the Grail. What the stories don't mention is what he did with it when he found it."
Rev. James Nighstroke, Professor Emeritus at St. Benedict's College on the Hudson
...and it was written that Jacob called up a dark and fell lord from the pit and entered into a bargain where he entrusted the most holy for the safe keeping...of mankind."