Kōshō (康正) was a Japanese era name (年号,, nengō,, lit. "year name") after Kyōtoku and before Chōroku. This period started in July 1455 and ended in September 1457.[1] During this time, the emperor was Go-Hanazono-tennō (後花園天皇).[2]
♯The Northern pretenders did not recognize the Genkō era. Gentoku was used in the Northern Court until 1332. ₪The Shōkyō era was recognized only by the Northern pretenders, not by the Southern Court. ‡ Upon reunification of the Northern and Southern Courts in 1392, Genchū was discontinued. Meitoku was used until 1394.