Tomoe Gozen was an onna-musha, a female samurai, mentioned in The Tale of the Heike. There is doubt as to whether she existed as she doesn't appear in any primary accounts of the Genpei war. She only appears in the epic "The tale of the Heike". She served under samurai lord Minamoto no Yoshinaka during the Battle of Awazu, part of the Genpei War in the late Heian period, which led to the establishment of the Kamakura shogunate.