For the formerly-German town of Gennin, see Jenin, Poland was a after Jōō and before Karoku. This period spanned the years from November 1224 to April 1225. The reigning emperor was . Change of era 1224 : The era name was changed to mark an event or a number of events. The previous era ended and a new one commenced in Jōō 3. Events of the Gennin Era 1224 (Gennin 1): Kyogyoshinsho was believed to have been composed in 1224; and this is also considered the year in which Jōdo Shinshū was founded. 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 1220s in Japan