was a after Genkyū and before Jōgen. This period spanned the years from April 1206 through October 1207.Nussbaum, Louis-Frédéric. (2005). "Ken'ei" in Japan encyclopedia, p. 508; n.b., Louis-Frédéric is pseudonym of Louis-Frédéric Nussbaum, see Deutsche Nationalbibliothek Authority File . The reigning emperor was .Titsingh, Isaac. (1834). Annales des empereurs du japon, pp. 221-229; Brown, Delmer et al. (1979). Gukanshō, p. 340; Varley, H. Paul. (1980). Jinnō Shōtōki, pp. 220-221.
Change of era 1206 : 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 Genkyū 3, on the 27th day of the 4th month of 1206.Brown, p. 340.
Events of the Ken'ei era 1206 (Ken'ei 1, 2nd month): Shōgun Minamoto no Sanetomo's standing at court was raised to the 2nd rank of the 4th class.Titsingh, p. 227. 1206 (Ken'ei 1, 7th day of the 3rd month): The emperor planned to pay a visit to the sesshō Kujō Yoshitsune, but in the night before this visit, an unknown assassin was introduced secretly into Yoshitune's house, and he was stabbed by a spear pushed up from below the floor. No one was able to discover the perpetrator. Yoshitsune was then aged 38 years. The sadaijin Konoe Iezane succeeded Yoshitsune as sesshō; and the dainagon Fujiwara no Tadatsune became sadaijin.Titsingh, pp. 228-229; Brown, pp. 339-341. 1206 (Ken'ei 1, 12th month): Konoe Iezane ceases to function as sesshō (regent); and instead, he becomes kampaku (chancellor).Titsingh, p. 229.
Notes
References Brown, Delmer and Ichiro Ishida. (1979). The Future and the Past: a translation and study of the 'Gukanshō', an interpretative history of Japan written in 1219. Berkeley: University of California Press. ; OCLC 5145872 Kitagawa, Hiroshi and Bruce T. Tsuchida, eds. (1975). The Tale of the Heike. Tokyo: University of Tokyo Press. ; ; ; ; OCLC 193064639 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