Tosa Kinnō-tō (土佐勤王党, Tosa Imperialism party) was a political shishi (organization) of Bakumatsu era Japan which was loyal to the ideals of the sonnō Jōi movement. It was formed by Takechi Hanpeita, influenced by the effects of the Perry Expedition. The Kinnō-tō killing of Yoshida Tōyō on 6 May 1862, led to sonnō jōi becoming the prevalent philosophy of Tosa Domain, but the party was destroyed when Takechi was imprisoned and forced to commit seppuku by the former daimyō of Tosa Domain Yamauchi Yōdō in 1865.
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Tosa Kinnoto in the context of Okada Izō
Okada Izō (岡田 以蔵; February 14, 1838 – May 11, 1865) was a Japanese samurai of the late Edo period, feared as one of the four most notable assassins of the Bakumatsu period. He was a member of Tosa Kinnoto (Tosa Imperialism party, a loyalist clique of Tosa) in his hometown, Tosa Domain. Izō and Tanaka Shinbei were active in Kyoto as assassins under the leadership of Takechi Hanpeita.
His personal name (imina (諱)) was Yoshifuru.