Ōchō

Ōchō (応長?) was a Japanese era name (年号,, nengō,?, lit. "year name") after Enkyō and before Shōwa. This period spanned the years from April 1311 through February 1312. The reigning emperor was Hanazono-tennō (花園天皇?).

Read more about Ōchō:  Change of Era, Events of The Ōchō Era