Watanabe-no-Tsuna was armed with one of the most famous swords in early samurai History, a Tachi called
Sun-Nashi (Missing Sun) of a length of 2 shaku & 7 sun (roughly 81,8 cm), forged by the great Munechika, with the help of
Hachiman Daimyōjin, or so the legend says. One of the two earliest recorded swords used to perform
Tameshigiri, it has changed nicknames and owners multiple times. Among the nicknames of this sword were : Sun-Nashi, Tomokiri, Higekiri, Onikiri, Shishi no ko and Tomokiri (again).
Tomokiri (the Friend Slayer, or Equal Cutter), for having cut, by its own will, through the steel of another sword of great quality, Hizamaru, who had been made at the request of the Emperor of Japan, by a smith rival of Sun-Nashi's maker.
Higekiri (beard cutter) was earned when the blade beheaded a criminal, the earliest Tameshigiri recorded, attempted in the hands of Minamoto no Mitsunaka (Raiko's father)... the victim had a long beard, who was cut smoothly along the neck.
Onikiri (Oni Slayer), come from the incident of Ibaraki Dōji's severed arm.
Shishi no ko (lion's cub) came from a legend where it made noise like a roaring lion at night, as if possessed by some Yōkai. And
Tomokiri (again), after having by its own will (again), cut through a copy of its blade and shortened it in order to make it the same size. A similar story exist for Onimaru Kunitsuna, one of the Tenka Goken. Heirloom of the Seiwa Genji bloodline of the Minamoto Clan, treasured and used in combat by famous heroes, such as Raiko, Tsuna,
Minamoto no Yoshiie and his grandson Tameyoshi. It was Raiko who gave Higekiri to Watanabe-no-Tsuna, trusted friend and general. Latter it was inherited by Raiko's nephew and passed on in the Seiwa Genji family. Onikiri is to be displayed at the Edo Tokyo Museum from November 23, 2016 to January 29, 2017. ==In popular culture==