The revenge of the forty-seven rōnin, also known as the Akō incident or Akō vendetta, is a historical event in Japan in which a band of rōnin avenged the death of their master on 31 January 1703. The incident has since become legendary. It is one of the three major adauchi vendetta incidents in Japan, alongside the Revenge of the Soga Brothers and the Igagoe vendetta. Wikipedia