Tamiya Ryu Iaijutsu is a military art (Bugei) that was introduced in the Tensho Period (1573-1591) by its founder, Tamiya Heibei Narimasa. Narimasa, together with Katayama Hoki no kami Hisayasu (the founder of Hoki Ryu) and Sekiguchi Jushin (the founder of Sekiguchi Ryu) were pupils of Hayashizake Jinsuke Shigenobu, the founder of Iaijutsu. The style characteristics of the Tamiya School of Swordsmanship are: First Volume (Omote no Maki) containing eleven kata and Second Volume (Koran no Maki) containing fourteen kata.


Tamiya Ryū (Iaijutsu) has been passed down to the present day through various circumstances. Approximately 400 years ago, Hayashizaki Jinsuke Shigenobu, the founder of Shin Musō Hayashizaki Ryū, began to pass on his immediate teachings to Tamiya Heibei Shigemasa. From among the pupils of Hayashizake Jinsuke emerged the founders of Mugai Ryū (Nagano Muraku Kinrōsai), Sekiguchi Ryū (Sekiguchi Hachiroemon Jushin) and Hoki Ryu (Katayama Hoki no Kami Hisayasu). 
Shigemasa first took lessons in Musō Ryū from Higashi Shimotsuke no Kami, and later pursued a course of study in Shin Musō Hayashizaki Ryū under the guidance of Hayashizaki Jinsuke himself, adding his own ideas to what he was taught. It is said that he then attained the secrets of Shin Musō Hayashizaki Ryū, but with regard to his physical appearance there are no details available.