Kansei (寛政?) was a Japanese era name (年号,, nengō,?, lit. "year name") after Tenmei and before Kyōwa. This period spanned the years from January 1789 through February 1801. The reigning emperor was Kōkaku-tennō (光格天皇?).
Read more about Kansei: Change of Era, Events of The Kansei Era