Check out this article on the Revenge of the 47 Ronin.
“The revenge of the Forty-seven Ronin (四十七士 Shi-jū-shichi-shi?), also known as the Forty-seven Samurai, the Akō vendetta, or the Genroku Akō incident (元禄赤穂事件 Genroku akō jiken?) took place in Japan at the start of the 18th century. One noted Japanese scholar described the tale as the country’s “national legend.” It recounts the most famous case involving the samurai code of honor, bushidō.“