1840s in Japan

Emperor of Japan from 1846 to 1867

emperor of Japan (1800-1846)

was a after Tenpō and before Kaei. This period spanned the years from December 1844 through February 1848. The reigning emperors were and .

was a after Bunsei and before Kōka. The period spanned from December 1830 through December 1844. The reigning emperor was .

was a after Kōka and before Ansei. This period spanned the years from February 1848 through November 1854. The reigning emperor was .

empress consort of Emperor Kōkaku; daughter of emperor Go-Momozono