NAKAI, MASAKATSU 中井正勝
Middle school teacher in Sakai, Osaka. Teacher of Yagyu Shingan-ryu Jujutsu with whom Morihei UESHIBA studied in the early 1900s in Kai-machi, Sakai City, near Osaka. The Nakai dojo opened on 19 September 1891. Ueshiba received a MENKYO KAIDEN certificate from Nakai in 1908. Masanosuke Tsuboi, the highest-ranking shihan of the Nakai dojo, may actually have been Ueshiba's direct instructor since his name also appears on the certificate.