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Japanese chief minister Ii Naosuke was assassinated by rōnin samurai upset with his role in opening Japan to foreign powers.

Historical image related to Japanese chief minister Ii Naosuke was assassinated by rōnin samurai upset with his role in opening Japan to foreign powers. from March 24, 1860

Ii Naosuke

Feudal lord and statesman in Tokugawa Japan (1815–1860)

Ii Naosuke was a daimyō of Hikone (1850–1860) and also Tairō of the Tokugawa shogunate, Japan, a position he held from April 23, 1858, until his assassination in the Sakuradamon Incident on March 24, 1860. He is most famous for signing the Harris Treaty with the United States,…
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Sakuradamon Incident (1860)

Japanese assassination of a Tokugawa official

The Sakuradamon Incident was the assassination of Ii Naosuke, Chief Minister (Tairō) of the Tokugawa shogunate, on March 24, 1860 by rōnin samurai of the Mito Domain and Satsuma Domain, outside the Sakurada Gate of Edo Castle.
Source: Wikipedia (CC BY-SA)

Rōnin

Samurai without a lord or master

In feudal Japan to early modern Japan (1185–1868), a rōnin was a samurai who had no lord or master and in some cases, had also severed all links with his family or clan. A samurai became a rōnin upon the death of his master, or after the loss of his master's favor or legal…
Source: Wikipedia (CC BY-SA)