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Kōji (Heian period)
Kōji (康治) was a Japanese era name (年号,,nengō,, lit. "year name") after Eiji and before Ten'yō. This period spanned the year from April 1142 through February 1144. The reigning emperor was Konoe-tennō (近衛天皇).
January 29, 1142Kōji gannen (康治元年): The new era name was created to mark an event or series of events. The previous era ended and a new one commenced in Eiji 2, on the 28th day of the 4th month of 1142.