Kenji (era)
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?).
Read more about Kenji (era): Change of Era, Events of The Kenji Era