was a after Ninji and before Hoji. This period spanned the years from February 1243 to February 1247. The reigning emperor was . Change of era ; 1243: 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 Ninji 4. Events of the Kangen era 1244 (Kangen 2): In the spring of this year, a number of extraordinary phenomena in the skies over Kamakura troubled Yoritsune deeply. 1244 (Kangen 2, 4th month): Yoritsune's son, Yoritsugu, had his coming-of-age ceremonies at age six. In the same month, Yoritsune asked Emperor Go-Saga for permission to give up his responsibilities as shōgun in favor of his son, Kujō Yoritsugu. September 11, 1245 (Kangen 3, 7th month): Yoshitsune shaved his head and became a Buddhist priest. 1246 (Kangen 4, 7th month): Yoritsune's son, now Shōgun Yoritsugu (who is only 7 years old) marries the sister of Hōjō Tsunetoki (who is himself only 16 years old). 1246 (Kangen 4): In the 4th year of Go-Saga-tennōs reign (後嵯峨天皇4年), he abdicated; and despite the succession (senso) was received by his 4-year-old son. Shortly thereafter, Emperor Go-Fukakusa is said to have acceded to the throne (sokui). Notes References Nussbaum, Louis-Frédéric and Käthe Roth. (2005). Japan encyclopedia. Cambridge: Harvard University Press. ; OCLC 58053128 Titsingh, Isaac. (1834). Nihon Odai Ichiran; ou, Annales des empereurs du Japon. Paris: Royal Asiatic Society, Oriental Translation Fund of Great Britain and Ireland. OCLC 5850691 Varley, H. Paul. (1980). A Chronicle of Gods and Sovereigns: Jinnō Shōtōki of Kitabatake Chikafusa. New York: Columbia University Press. ; OCLC 6042764 External links National Diet Library, "The Japanese Calendar" -- historical overview plus illustrative images from library's collection Japanese eras 1240s in Japan