, also romanized as Jō-ō, was a Japanese era name (年号, nengō, lit. year name) after Jōkyū and before Gennin. This period spanned the years from April 1222 to November 1224. The reigning emperor was Go-Horikawa-tennō. Change of era 1222 : The era name was changed to Jōō (meaning "Righteous Answer") to mark an event or a number of events. The previous era ended and a new one commenced in Jōkyū, on the 13th day of the 4th month of 1222. Events of the Jōō era 1222 (Jōō 2): Regulations established concerning salaries for Jitō July 19, 1223 (Jōō 2, 20th day of the 6th month): The buildings of the Asama Shrine at the base of Mount Fuji in Suruga province were re-built by Hōjō Tokimasa. 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 Ponsonby-Fane, Richard Arthur Brabazon. (1962). Studies in Shinto and Shrines. Kyoto: Ponsonby Memorial Society. OCLC 3994492 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