was a after Kyōtoku and before Chōroku. This period spanned the years from July 1455 through September 1457.Nussbaum, Louis-Frédéric. (2005). "Kōshō" in Japan encyclopedia, p. 564; 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. 331-349.
Change of Era 1455 : The era name was changed to mark an event or a number of events.
Events of the Kōshō era 1456 (Kōshō 2, 3rd month): Ashikaga Yoshimasa visited Iwashimizu Shrine; and all the officials of the Daijō-kan joined him in going there.Titsingh, p. 348. 1456 (Kōshō 2, 8th month): The father of Emperor Go-Hanazono, Fushimi-no-miya-shinnō Sadafusa, died at age 85.
Notes
References Nussbaum, Louis Frédéric and Käthe Roth. (2005). Japan Encyclopedia. Cambridge: Harvard University Press. ; OCLC 48943301 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
External links National Diet Library, "The Japanese Calendar" -- historical overview plus illustrative images from library's collection