, also known as , was a samurai of the Tosa han during the Bakumatsu period in Japan. As leader of the Tosa Kin no To, which supported the Sonnō Jōi

Sonno joi

is a Japanese political philosophy and a social movement derived from Neo-Confucianism; it became a political slogan in the 1850s and 1860s in the movement to overthrow the Tokugawa bakufu, during the Bakumatsu period.-Origin:...

('revere the Emperor and expel the barbarians') movement, he tried to take control of the Tosa Han and receive the support of Sakamoto Ryōma

Sakamoto Ryoma

was a leader of the movement to overthrow the Tokugawa shogunate during the Bakumatsu period in Japan. Ryōma used the alias .- Early life :Ryōma was born in Kōchi, of Tosa han . By the Japanese calendar, this was the sixth year of Tenpō...

, but was arrested for the assassination of Yoshida Tōyō and forced to commit seppuku

Seppuku

is a form of Japanese ritual suicide by disembowelment. Seppuku was originally reserved only for samurai. Part of the samurai bushido honor code, seppuku was either used voluntarily by samurai to die with honor rather than fall into the hands of their enemies , or as a form of capital punishment...

. He gave orders to Okada Izō

Okada Izo

was a Japanese samurai of the late Edo period, feared as one of the four most notable assassins of the Bakumatsu period. He was born in Tosa to the gōshi Okada Gihei, who had been a peasant but had bought the gōshi rank...

, one of the best known assassins of the Bakumatsu period.