Kōō (Nanboku-chō period)

, also romanized as Kō-ō, was a Japanese era name (年号, "nengō", lit. year name) of the Northern Court during the Nanboku-chō period after Kakei and before Meitoku. This period started in February 1389 and ended in March 1390. The pretender in Kyoto was . Go-Komatsu's Southern Court rival in Yoshino during this time was .