Kenji (era) Kenji is a Japanese era name which followed Bun'ei and preceded Kōan. This period spanned the years from April 1275 to February 1278. The reigning emperor was Emperor Go-Uda.Change of era1275 Kenji gannen: 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. The era name comes from the Rites of Zhou and combines the characters and .Events of the ''Kenji'' era1275 : 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.November 23, 1275 : Hirohito-shinnō was named Crown Prince and heir to his first cousin, the Daikakuji-tō Emperor Go-Uda. This was the result of political maneuvering by Hirohito's father, the Jimyōin-tō Emperor Go-Fukakusa.1277 : Yoshimasa laid down his office.