ChōkanChōkan was a Japanese era name after Ōhō and before Eiman. This period spanned the years from March 1163 through June 1165. The reigning emperors were Emperor Nijo and Emperor Rokujō-tennō.Change of eraFebruary 5, 1163 Chōkan gannen: The new era name was created to mark an event or series of events. The previous era ended and a new one commenced in Ōhō 3, on the 29th day of the 3rd month.Events of the ''Chōkan'' era1163 : Taira no Shigemori was promoted to the second rank of the 3rd class in the court hierarchy.1163 : A large congregation of Buddhist priests came together at the Tōdai-ji and Kōfuku-ji temples to recite prayers for the prosperity of the Imperial Family.September 14, 1164 : The former-Emperor Sutoku died at the age of 46.