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Kōchō ( was a 弘長) Japanese era name ( after 年号, , lit. "year name") nengō, and before Bun'ō This period spanned the years from February 1261 to February 1264. Bun'ei. The reigning emperor was  Kameyama -tennō (. 亀山天皇)
Change of era
Kōchō gannen (; 1261: 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 弘長元年) Bun'ō 2.
Events of the Kōchō era
June 11, 1261 ( Kōchō 1, 12th day of the 5th month): Nichiren was exiled to Itō in Izu. 
March 19, 1262 ( Kōchō 2, 28th day of the 11th month): Shinran passes away at the age of 90 April 1, 1263 ( Kōchō 3, 22nd day of the 2nd month): Nichiren was pardoned. 
^ Nussbaum, Louis-Frédéric. (2005). "
Kōchō" in Japan Encyclopedia, p. 539, at , p. 539 Google Books; n.b., Louis-Frédéric is pseudonym of Louis-Frédéric Nussbaum, see Deutsche Nationalbibliothek Authority File Archived 2012-05-24 at Archive.today.
^ Titsingh, Isaac. (1834).
Annales des empereurs du Japon, pp. 255-261; Varley, H. Paul. (1980). Jinnō Shōtōki. p. 232-233.
^ a b Nichren. (2004).
Writings of Nichiren Shonin: Doctrine 3, p. 47.