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Takano Choei: Bansha Persecution, Prison Break, and Final Suicide
Takano Choei (1804-1850), trained at Siebold's Narutaki School, was sentenced to life imprisonment in the 1839 Bansha Persecution after criticizing the shogunate's foreign-ship expulsion policy. Escaping during a 1844 prison fire, he disfigured his face with acid and continued translating Western military texts in hiding until cornered and dying at 47.
武
Author
Taketoki
| Samurai History
Takano Choei (1804-1850), born to a doctor’s family in Mizusawa (modern Iwate Prefecture), trained in Western medicine and science under Philipp Franz von Siebold at the Narutaki School in Nagasaki. Joining the Shoshikai study group with Watanabe Kazan in Edo, he authored Bojutsu Yume Monogatari (1838) criticizing the shogunate’s foreign-ship expulsion policy. The 1839 Bansha Persecution sentenced him to life imprisonment, but he escaped during a fire at Denmacho prison in 1844. To evade pursuit he reportedly burned his face with nitric acid, then translated Western military texts in hiding (the influential Sanpei Takutiki). When his Aoyama hideout was raided in 1850, he died at age 47 — by suicide or in struggle. His translations contributed to the Meiji-era military modernization 18 years later.
Last updated: May 2, 2026
Portrait of Takano Choei — Western-studies scholar
Wikimedia Commons / Public Domain
Siebold's Narutaki School — where Choei studied Dutch medicine
Wikimedia Commons / Public Domain
Denmacho Prison — Choei escaped during 1844 fire
Wikimedia Commons / Public Domain
Portrait of Watanabe Kazan — Choei's ally, also persecuted
Wikimedia Commons / Public Domain
Bojutsu Yume Monogatari — Choei's 1838 critique that triggered persecution
Wikimedia Commons / Public Domain
── 了 ──
武
Author
Taketoki（たけとき）
Samurai History
Toku editorial team — samurai history. Insists on primary sources and castle-layout diagrams, walking battlefields from Yoritomo's Izu exile sites to the late-Edo battlegrounds.
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