Tennen Rishin-ryu (天然理心流) is a Japanese martial art, commonly known as the style practiced by several core members of the Shinsengumi.
Founded by Kondō Kuranosuke Nagahiro around 1789, the style was popularized by Kondō Shūsuke (1792-1867), the third generation master of the style, who, together with
Satō Hikogorō, spread its practice throughout the farming population of the Tama district. Since the first and the second generation masters each adopted a student with
superb skills to be the next master, in 1849 the childless Kondō Shūsuke decided to adopt a sixteen-year-old student named Miyagawa Katsugorō, the later Kondō