The Edo period marked the start of 250 years of peace for Japan, but it came as a death sentence for shinobi. These highly trained spies mastered the art of deception and infiltration, and some even worked as assassins. But when these talented figures started dying out, legend and mythology took their place, and eventually turned into the classic ninja characters we see in movies and TV today. Learn more on this episode of Rogue History! | PBS Origins