Ii Naosuke (November 29, 1815 ¡V March 24, 1860) was daimy? of Hikone (1850¡V1860) and also Tair? of the Tokugawa shogunate, Japan, a position he held from April 23, 1858, until his death, assassinated in the Sakuradamon Incident on March 24, 1860. He is most famous for signing the Harris Treaty with the United States, granting access to ports for trade to American merchants and seamen and extraterritoriality to American citizens. Ii was assassinated in the Sakuradamon incident by a group of 17 Mito and 1 Satsuma samurai on March 24, 1860.