was a after Bun'ō and before Bun'ei. This period spanned the years from February 1261 to February 1264.Nussbaum, Louis-Frédéric. (2005). "Kōchō" in ; n.b., Louis-Frédéric is pseudonym of Louis-Frédéric Nussbaum, see Deutsche Nationalbibliothek Authority File . The reigning emperor was .Titsingh, Isaac. (1834). Annales des empereurs du Japon, pp. 255-261; Varley, H. Paul. (1980). Jinnō Shōtōki. p. 232-233.
Change of era ; 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 Bun'ō 2. The era name comes from The Political Program of the Zhenguan Period and combines the characters ("broad") and ("long").
Events of the Kōchō era June 11, 1261 (Kōchō 1, 12th day of the 5th month): Nichiren was exiled to Itō in the Izu Province.Nichren. (2004). Writings of Nichiren Shonin: Doctrine 3, p. 47. 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.
Notes
References Nichiren. (2004). Writings of Nichiren Shonin: Doctrine 3. onolulu: University of Hawaii Press. 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