Emperor Junna

Emperor Junna (786–840), a son of Emperor Kanmu, was Japan's 53rd emperor, reigning from 823 to 833. Made crown prince in 810 after the Kusuko Incident, he succeeded Emperor Saga in 823.

He promoted able officials and oversaw the legal commentary Ryō no Gige and the court chronicle Nihon Kōki. In 833 he abdicated in favor of his nephew Emperor Ninmyō and retired to the Junna-in villa. He died in 840, leaving orders for a simple burial; the disputed succession after his death sparked the Jōwa Incident.