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Jian ( was a 治安) Japanese era name (, also known as 年号, , lit. "year name") nengō, Chi'an, after and before Kannin This period spanned the years from February 1021 Manju. through July 1024.  The reigning emperor was  Go-Ichijō -tennō (. 後一条天皇)
Change of Era
1021 Jian gannen (: The era name was changed to mark an event or series of events. The previous era ended and a new one commenced in 治安元年) 5, on the 2nd day of the 2nd month of 1021. Kannin 
Events of the Jian era
1023 ( Jian 3, 4th month): An epidemic in Kyoto was so severe that there were corpses in the streets; disease spread throughout the country.  
1023 ( Jian 3, 10th month): Fujiwara no Michinaga visits Mt. Koya.  December 29, 1023 ( Jian 3, 14th day of the 11th month): a lunar eclipse. 
^ Nussbaum, Louis-Frédéric. (2005). "
Kannin" in Japan Encyclopedia, p. 474, at , p. 474 Google Books; n.b., Louis-Frédéric is pseudonym of Louis-Frédéric Nussbaum, see Deutsche Nationalbibliothek Authority File Archived 2012-05-24 at Archive.today.
^ Nussbaum. "
Manjū" at , p. 607, at p. 607. Google Books
^ Titsingh, Isaac. (1834).
Annales des empereurs du Japon, pp. 156-159; Brown, Delmer et al. (1979). Gukanshō, pp. 307-310; Varley, H. Paul. (1980). Jinnō Shōtōki. p. 195-196.
^ Brown, p. 310.
^ Dykstra, Yoshiko Kurata. (2001).
The Konjaku Tales: from a Medieval Japanese Collection, Vol. 2, p. 13.
^ Horton, Sarah J. (2007).
Living Buddhist Statues in Early Medieval and Modern Japan,, p. 143, at p. 143. Google Books
Nihon Kiristokyō Kyōgikai. (2001). Japanese Religions, Vols. 26-27, pp.34-35.
^ Pankenier, David. (1999).
Archaeoastronomy in East Asia: Historical Observational Records of Comets and Meteor Showers from China, Japan, and Korea,, p. 89, at p. 89. Google Books