Perhaps the most notorious Friday the 13th was October 13, 1307. According to legend, that was the day French King Philip IV had hundreds of Knights Templar—a wealthy and powerful group of religious warriors—arrested, imprisoned and, in many cases, killed for posing a threat to his power base. Jacques de Molay, the last of the Templar Grand Masters, was purportedly burned to death outside Notre Dame Cathedral on Friday, March 13, 1314—cursing the King and 13 generations of his family to lives of misery in the process.