Sakuradamon Incident
1860 CE.
Shown on the map at 35.678°, 139.753°.
The Sakuradamon Incident (桜田門外の変, Sakuradamon-gai no Hen; or 桜田門の変 Sakuradamon no Hen) was the assassination of Ii Naosuke, Chief Minister (Tairō) of the Tokugawa shogunate, on March 24, 1860 by rōnin samurai of the Mito and Satsuma Domains, outside the Sakurada Gate of Edo Castle.
Text from the Wikipedia article Sakuradamon Incident (1860), licensed CC BY-SA 4.0.