Kenji (建治) is a Japanese era name (年号,,nengō,, lit. "year name") which followed Bun'ei and preceded Kōan. This period spanned the years from April 1275 to February 1278. The reigning emperor was Go-Uda-tennō (後宇多天皇).
1275 Kenji gannen (建治元年): The new era name was created to mark an event or a number of events. The previous era ended and a new one commenced in Bun'ei 12.
Events of the Kenji era
1275 (Kenji 1): The Mongols sent an ambassador to Kamakura along with the delegation which accompanied the envoy from the Goryeo. The unwelcome visitor was put to death; and his severed head was publicly displayed.
1277 (Kenji 3, 5th month): Yoshimasa laid down his office.