Shinmen Munisai (新免 無二斎), also called Miyamoto Muninosuke,[1] was a martial artist, expert in using the sword and the jutte.
Munisai founded his own ryūha: the Tōri Jitte Ryū,[1] which was one of the schools taught to his adopted son Miyamoto Musashi, who conceived the Hyōhō Niten Ichi-ryū.
Here are a few possibilities: Sometime after Ashikaga Yoshiteru became the Shōgun, he started in Kyoto a comparison duel between Munisai, who was still called Hirata at the time, and the founder of the Yoshioka-ryū school of sword-fighting: Yoshioka Kenpo (who was also the sword instructor of the Ashikaga).
This event later started a feud between Munisai's son Miyamoto Musashi and the following generation of the Yoshioka family.
In 1589, for unknown reasons, Sokan ordered Munisai to kill his student Honiden Gekinosuke.