Muramasa (勢州桑名住村正) from the Tokyo National Museum. Muramasa Sengo (千子 村正, Sengo Muramasa) was a famous swordsmith who founded the Muramasa school and lived during the Muromachi period (14th to 16th centuries) in Japan. Oscar Ratti and Adele Westbrook said that Muramasa was a most skillful smith but a violent and ill-balanced mind verging on madness, that was supposed to have passed into his blades.