Kōei (康永) was a Japanese era name (年号, nengō, lit. year name) of the Northern Court during the Era of Northern and Southern Courts after Ryakuō and before Jōwa. This period spanned the years from April 1342 to October 1345.[1] The emperor in Kyoto was Emperor Kōmyō (光明天皇, Kōmyō-tennō).[2] Go-Kōgon's Southern Court rival in Yoshino during this time-frame was Emperor Go-Murakami (後村上天皇, Go-Murakami-tennō).