Heinrich Himmler and the Holy Grail
The Nazi’s and HImmler especially were fascinated with the occult, the paranormal and the mystical, so of course, they tried to find the Holy Grail. He once led a mission to an abby in Spain that was rumoured to the final resting place of the chalice, only to leave empty handed.
He figured that whomever controlled the grail, would win the war. He chose poorly.