Ansei

Ansei was a Japanese era name used from 1854 to 1860 during the reign of Emperor Kōmei. Its years encompassed the opening of Japan to foreign trade and major political upheaval.

Japanese era name: A reign-associated name used to identify years in Japan’s traditional and modern calendar systems. Ansei was one such name, replacing Kaei in 1854.
Convention of Kanagawa: A 1854 agreement that opened Japanese ports to American ships and established relations with the United States. Signed in Ansei 1, it marked a major break with Japan’s restrictions on foreign contact.
Ii Naosuke: A Japanese statesman who served as chief senior councilor of the Tokugawa shogunate from 1858 until his assassination in 1860. He authorized treaty concessions and the Ansei Purge, becoming a central target of opposition.
Meiji: A Japanese era name beginning in 1868, associated with Emperor Meiji and the modernization of Japan. Meiji followed Ansei-era turmoil and began a new imperial government.
Kōmei: The 121st emperor of Japan, who reigned from 1846 to 1867. Ansei fell within Kōmei’s reign.
Harris Treaty: A 1858 treaty that opened additional Japanese ports and granted foreigners extraterritorial rights. Its signing in Ansei 5 intensified disputes over foreign treaties.
Sonnō jōi: A political slogan meaning “revere the emperor, expel the barbarians,” influential in late Tokugawa Japan. Resistance to Ansei-era foreign treaties gave the slogan renewed force.
Bunkyū: A Japanese era name used from 1861 to 1864. Bunkyū followed Man’en, carrying forward political instability after Ansei.
Kaei: A Japanese era name used from 1848 to 1854. Kaei immediately preceded Ansei.
Ansei Purge: A 1858–1859 crackdown by the Tokugawa shogunate on political opponents of its policies. The purge gives the era its name in a major episode of political repression.

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