Ittō-ryū
Ittō-ryū (一刀流), meaning "one-sword school", is the ancestor school of several Japanese Koryū kenjutsu styles, including Ono-ha, Mizoguchi-ha, Nakanishi-ha, Kogen, Hokushin, Itto Shoden and even Mugai Ryu. The style was developed by Itō Ittōsai Kagehisa.