Emperor Ninmyō

Emperor Ninmyō (810–850) was the 54th emperor of Japan, reigning from 833 to 850, and the first emperor born in Heian-kyō. The second son of Emperor Saga, he was named crown prince in 823 and succeeded his uncle Emperor Junna in 833.

Tang-style rites and Chinese poetry flourished at his court, and a last embassy to Tang China sailed in 838–839. After the Jōwa Incident of 842, the crown prince was deposed and his son Prince Michiyasu made crown prince. Chronically ill, Ninmyō abdicated in 850 and died two days later.