弘こう長ちょうこうちょうMeanings1nounKōchō era (1261.2.20-1264.2.28)Japanese era name (年号) of the Kamakura period. Used in historical contexts.弘こう長ちょう元がん年ねんは西せい暦れき1261年ねんにあたる。The first year of the Kōchō era corresponds to 1261 CE.