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Jōō (貞応), 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 Jōō gannen (貞応元年): 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.
- Nussbaum, Louis-Frédéric. (2005). "Jō-ō" in Japan encyclopedia, p. 432; n.b., Louis-Frédéric is pseudonym of Louis-Frédéric Nussbaum, see Deutsche Nationalbibliothek Authority File.
- Titsingh, Isaac. (1834). Annales des empereurs du Japon, pp. 238-241; Brown, Delmer et al. (1979). Gukanshō, pp. 341-343; Varley, H. Paul. (1980). Jinnō Shōtōki. pp. 226-227.
- Brown, p. 346.
- Ponsonby-Fane, Richard. (1962). Studies in Shinto and Shrines, p. 461.
- 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. ISBN 978-0-520-03460-0; 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. ISBN 978-0-674-01753-5; 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. ISBN 9780231049405; OCLC 6042764
- National Diet Library, "The Japanese Calendar" -- historical overview plus illustrative images from library's collection