Emperor Kōkō

Emperor Kōkō (830–887) was the 58th emperor of Japan, reigning from 884 to 887. The third son of Emperor Ninmyō, he was placed on the throne in 884 by the kampaku Fujiwara no Mototsune after Emperor Yōzei's deposition, and Kōkō entrusted him with government.

On his enthronement he demoted all his children to commoner rank, but on his deathbed in 887 he restored his son Minamoto no Sadami to imperial status as crown prince; Sadami succeeded him as Emperor Uda that same day.