Emperor Kōkaku

Emperor Kōkaku was the 119th emperor of Japan, according to the traditional order of succession. Kōkaku reigned from 1779 until his abdication in 1817 in favor of his son, Emperor Ninkō. After his abdication, he ruled as Daijō Tennō also known as a Jōkō (上皇) until his death in 1840. The next emperor to abdicate was Akihito, 202 years later.