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In Japanese mythology, Futsunushi(経津主神,Futsunushi no kami?) is a kami of swords, thus his shinto priests are supposed to always wear Nihintō with them, at least in the shrine. He is a general of Amaterasu along with Takemikazuchi. As the god of Katori shrine and god of martial arts, Katori Shintō-ryū adepts make a solemn oath when they join the school.