Kōchō (弘長) was a Japanese era name (年号, nengō, lit. "year name") after Bun'ō and before Bun'ei. This period spanned the years from February 1261 to February 1264.[1] The reigning emperor was Kameyama-tennō (亀山天皇).[2]
Kōchō gannen (弘長元年); 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 弘 ("broad") and 長 ("long").