1800s in Japan

Emperor of Japan from 1780 to 1817

was a after Kyōwa and before Bunsei. The period spanned the years from January 1804 to April 1818. The reigning emperors were and .

was a after Tenmei and before Kyōwa. This period spanned the years from January 1789 through February 1801. The reigning emperor was .

was a after Kansei and before Bunka. This period spanned the years from February 1801 through February 1804. The reigning emperor was .

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