was a daimyō (feudal lord) of Hikone (1850–1860) and also Tairō 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. He was also an enthusiastic and accomplished practitioner of the Japanese tea ceremony, in the Sekishūryū style, and his writings include at least two works on the tea ceremony.
Under Ii Naosuke's guidance, the Tokugawa shogunate navigated past a particularly difficult conflict over the succession to the ailing and childless Tokugawa Iesada. Ii Naosuke managed to coerce the Tokugawa shogunate to the last brief resurgence of its power and position in Japanese society before the start of the Meiji period. Ii was assassinated in the Sakuradamon incident by a group of 17 Mito and 1 Satsuma samurai on March 24, 1860.
Early life
Ii Naosuke was born on November 29, 1815, as the 14th son of Ii Naonaka, the daimyō of Hikone by his concubine. Since Naosuke was the 14th son, he was not in line for a prominent position and early in his life was sent to a Buddhist temple where he lived on a small stipend from his family. Fortunately for Ii, even though he was sent to the monastery, his 13 elder brothers were either adopted into other families who needed an heir, or died before they succeeded their father. Accordingly, when his father died in 1850, Ii was called back from the monastery and became the daimyō of Hikone, a fudai domain, and took the family name of Ii. As the daimyō of Hikone, Ii was one of the daimyōs who were eligible for a position in the bakufu, the council of the shōguns advisors. His childhood name was Tetsunosuke (鉄之介).
Ii became involved in national politics, rapidly rising to lead a coalition of daimyōs. In 1853 Ii put forward a proposal concerning the Japanese negotiations with U.S. Commodore Matthew C. Perry during Perry's mission to open Japan to the outside world. Realizing that Japan was faced with immediate military danger Ii argued that Japan should use their relationship with the Dutch to allow them to buy enough time to develop armed forces, which could resist invasion. Ii recommended that only the port of Nagasaki be opened for trade with foreigners Ii, like Hotta Masayoshi, refused to remain silent while shogunal advisor Abe Masahiro appeased the anti-foreign party. Ii led the fudai daimyōs in their effort to bring about the downfall of Abe Masahiro and replace him with Hotta Masayoshi. This alienated many reformist daimyōs, leading them to strengthen their association with the Imperial court.
Family
Father: Ii Naonaka (1766–1831) Mother: Otomi no Kata (1785–1819) Foster father: Ii Naoaki (1794–1850) Wife: Masako (1834–1885) Concubines: Senda Shizue Nishimura Sato Children: Ii Naonori by Nishimura Sato daughter Son Chiyoko (1846–1927) married Matsudaira Yoritoshi Ii Naotomo (1849–1887) by Masako Ii Naoyasu (1851–1935) by Nishimura Sato daughter son Manchiyo daughter son Michiyo daughter Ii Naoyuki (1858–1927) by Masako Tokiko married Aoyama Yukiyoshi
Tairō
In 1858 after Hotta Masayoshi's disastrous attempt to obtain the emperor's approval for the Harris treaty the Tokugawa shōgun Tokugawa Iesada chose Ii Naosuke to be the Tairō (Great Elder); a decision influenced by the Kii Party. The position of Tairō, a post traditionally held by members of the Ii family, was rarely filled; in fact there had only been three Tairō between 1700 and Ii Naosuke's rise to power 158 years later. Ii's promotion to the post of Tairō annoyed many of the shinpan daimyōs (daimyōs related to the shōgun, they were unable to be members of the bakufu, but in the event of the shōgun dying heirless the next shōgun would be chosen from one of the shinpan families) including Tokugawa Nariaki. As the Tairō Ii Naosuke had both prestige and power second only to the shōgun; Ii also enjoyed the full backing of the fudai daimyōs. An intelligent and capable politician Ii Naosuke was determined to restore the power of the bakufu in Japanese policy making, both in a domestic and a foreign role.
Ii Naosuke regarded the Harris treaty, which Hotta Masayoshi had negotiated with the American envoy Townsend Harris as in Japan's best interests. In accordance with the protocol he asked the three house lords of the gosankyō for their views in writing. However Ii faced a problem in the form of an obstructionist policy from members of the Hitotsubashi faction led by Hitotsubashi Keiki's father Tokugawa Nariaki.