Takechi Zuizan (武市瑞山), (October 24, 1829 – July 3, 1865), also known as Takechi Hanpeita (武市 半平太), was a samurai of Tosa Domain during the Bakumatsu period in Japan. Influenced by the effects of the Perry Expedition, Takechi formed the Tosa Kinnō-tō (土佐勤王党, Tosa Imperialism party) which was loyal to the ideals of the sonnō jōi movement. The Kinnō-tō killing of Yoshida Tōyō on 6 May 1862, led to sonnō jōi becoming the prevalent philosophy of Tosa Domain, but he was later imprisoned and forced to commit seppuku by the former daimyō of Tosa Domain Yamauchi Yōdō.

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Takechi Zuizan
武市瑞山
Takechi Zuizan
Born	(1829-10-24)October 24, 1829 Kōchi, Tosa Province, Japan
Died	July 3, 1865(1865-07-03) (aged 35) Kōchi, Japan
Nationality	Japanese
Other names	Takechi Hanpeita
Occupation	Samurai

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Takechi was born in Fukii Village, Tosa Province (now Niida, Kōchi City, Kōchi Prefecture) as the son of an upper-class samurai of Tosa Domain. The Takechi family had originally been lower-class samurai, but five generations previously had become wealthy through farming and had successfully petitioned to have their official status changed. In 1841, he became a disciple of the Nakanishi-ha Ittō-ryū style of Japanese swordsmanship. His parents died in 1849, and the same year he married the eldest daughter of Shimamura Genjirō to support his remaining elderly grandmother. The following year, he moved to the Kōchi jōkamachi. He opened his own dōjō in 1854 and by 1855 had gathered over 120 disciples, including Nakaoka Shintarō and Okada Izō. As Takechi's fame as a swordsman increased, he was ordered by the domain to Edo to reform the clan's official dōjō there. Around this time, he met Sakamoto Ryōma, who was already in Edo as a student at the Chiba dōjō for the Hokushin Ittō-ryū. In September 1858 he received word of his grandmother's worsening health, and returned to Kōchi.

In February 1859, the daimyō of Tosa Domain Yamauchi Yōdō, was forced from office and placed under house arrest by the tairō Ii Naosuke for his efforts to establish Hitotsubashi Yoshinobu as successor to the shogunate. This outraged many of the Tosa samurai, who later applauded Ii's assassination in the Sakuradamon Incident of March 1860. The sonnō jōi movement also spread quickly in Tosa, after many were alarmed by the arrival of the Perry Expedition in 1858 and what they perceived to be the weak response of the Tokugawa shogunate to this threat. In May 1860, Takechi went on a tour of Kyushu and western Japan with a number of his closest disciples, and returned with some of the works of kokugaku scholar Hirata Atsutane, which further reinforced his belief in the Sonnō jōi movement.In April 1861, Takechi returned to Edo under the guise of practicing swordsmanship, but in realty to meet with like-minded samurai of various domains, including Katsura Kogōrō, Kusaka Genzui, and Takasugi Shinsaku of Chōshū, Kabayama Sanin from Satsuma and Iwama Kanpei from Mito. Takechi was particular interested in the teachings of Chōshū Yoshida Shōin as relayed to him by Kusaka. Increasingly concerned by the lack of action by their domain governments, the samurai of the three domains agreed to a three-point course of action: to force their domains to take action to expel the foreigners from Japan, to force their lords to enter Kyoto, and to force the Imperial Court to issue edicts against the unequal treaties with the foreign powers and Tokugawa shogunate. In August, Takechi secretly created the Tosa Kinnō-tō, recruiting 192 members, mostly from the lower-ranked samurai and some ronin formerly of Tosa Domain. Around this time, Tosa Domain was largely governed by Yoshida Tōyō, a trusted advisor to Yamauchi Yōdō. Yoshida was pursuing Yōdō's policy of supporting the opening of the country to foreign trade in order to gain western technology and weaponry which would help guard its independence, and also the Kōbu gattai policy of uniting the shogunate and imperial court. He dismissed Takechi's petitions as being childishly simplistic and unrealistic and rejected thoughts of uniting with other domains to oppose the shogunate. Eventually, Takechi decided that his only course of action would be to assassinate Yoshida and to kidnap the young daimyō, Yamauchi Tomonori en route to Edo on his sankin kōtai. On April 8, 1862 three members of the Tosa Kinnō-tō murdered Tōyō before fleeing Tosa and Takechi took action to seize control of the Tosa government.

However, prior to this, Shimazu Hisamitsu of Satsuma had entered Kyoto but was soon expelled after the Teradaya incident by the forces of Chōshū, when then received an Imperial order mediate in national political affairs and to expel all foreigners from Japan. Takechi dispatched the Tosa Kinnoto to Kyoto to seek a similar privilege for Tosa, which was granted. The number of Tosa troops in Kyoto was increased to over 2000 and Yamauchi Yōdō established his residence there, while Tosa Kinnoto members roamed Kyoto and its surroundings as a death squad, killing political opponents, as supporters of the assassinated Yoshida Tōyō and members of the Shinsengumi and other Shogunal paramilitary forces in Kyoto. Takechi drafted petitions in the name of Yamauchi Tomonori to the emperor advocating a restoration of imperial rule, whereby the five provinces of the Kinai region should be placed under direct imperial control, a national military responsible to the emperor should be created, and that future ordinances should be issued from the throne and not the shogun, and that the foreigners should be immediately expelled. He was sent to Edo as an official envoy of the Emperor, and was received in audience by Shogun Tokugawa Iemochi, which gave a vague and noncommittal response. He returned to Kyoto to receive unprecedented honors; however, he also received the increasing displeasure of Yamauchi Yōdō, who soon took action to suppress the Tosa Kinnō-tō and to prohibit their political negotiations with the Court and other domains. Takeuchi was dismissed and ordered back to Tosa, but he continued to work towards creating the Satchō Alliance. Yamauchi Yōdō meanwhile had been searching for the assassins of Yoshida Tōyō and arrested three members of the Tosa Kinnō-tō, who confessed to the crime under interrogation. Takechi refused suggestions that he should flee Tosa, and continued to offer unsolicited political advice to Yamauchi Yōdō. In September, Takechi and other Tosa Kinnō-tō members were arrested, and although lower-ranking members were tortured, Takechi himself was initially not harmed and continued to deny involvement in Yoshida Tōyō's murder. In September the following year, an uprising of samurai sympathetic to Takechi was suppressed and the roundup of Tosa Kinnō-tō members and supporters continued. On July 3, 1865 four leaders of the Tosa Kinnoto were sentenced to death by decapitation, and Takechi was ordered to commit seppuku by Yamauchi Yōdō. He had been imprisoned for 1 year 8 months and 20 days.^[1]

With Takechi's death, the Tosa Kinnō-tō was destroyed. Some survivors, including Nakaoka Shintarō, left the domain, becoming ronin and continued to engage in anti-shogunate activities. Later, through Nakaoka's mediation, Tosa eventually joined the anti-shogunate alliance, and Gotō Shōjirō, a domain official who had led the suppression of the Tosa Kinnō-tō eventually became a political advisor and working with Sakamoto Ryoma towards restoration of Imperial rule. Takechi received posthumous pardons in 1877, and he was posthumous promoted to Senior Fourth Court rank by the Imperial Court in 1891.

Takechi's former residence in Kōchi and his nearby grave were designated a National Historic Site in 1936.^[2] The house is a wooden structure in a semi-rural area on the outskirts of Kōchi, and originally, had a thatched roof and six rooms plus an eight-tatami mat guest room with a pond and garden in front of this room on the southeast side. It is said that Takechi lived here until he was 20 or 22, after which he sold the house and established his dōjō in the castle town of Kōchi. There was also an earthen-walled storehouse (no longer existent) and a storeroom, making it a typical goshi-yashiki residence of mid- to upper level samurai in the Edo Period. The house is privately owned and is not open to the public.

Takechi's grave is located on the hill above the Zuizan Shrine, a Shinto shrine dedicated to his deified spirit, which is located south of the path in front of his former residence.^[1]

The 2015 series and film Samurai Sensei has Takechi Hanpeita as the main character.

The video game Like a Dragon: Ishin!, a spin off to the Like a Dragon franchise, features Hanpeita as the main antagonist. In the game he was the adopted brother of Sakamoto Ryoma and was voiced by Katsunori Takahashi in the original and by Hideo Nakano in the 2023 remake, in which he was made to resemble Yakuza 0 character Keiji Shibusawa, also voiced by Nakano.

• List of Historic Sites of Japan (Kōchi)