Emperor Nimmyo

Emperor Nimmyō (仁明天皇 Ninmyō Tennō) (810– March 21, 850) was the 54th imperial ruler of Japan, according to the traditional order of succession. He reigned from 833 to March 21, 850. His birth in name was Prince Masara (正良親王, Masara-shinnō). He was the second son of Emperor Saga by the Empress Tachibana no Kachiko.

He ascended to the throne following the abdication of his uncle, Emperor Junna. First he made a son of Junna the crown prince. Nine years later in 842 after a coup d'état that crown prince was replaced with Ninmyō's first son, Prince Michiyasu later Emperor Montoku whose mother was the Empress Fujiwara no Junshi, a daughter of Fujiwara no Fuyutsugu. It is supposed there was a political intrigue planned by Nimmyō and Fujiwara no Yoshifusa, the second son of Fuyutsugu and uncle of the new crown prince.
In 850 he abdicated in favor of the Crown Prince Michiyasu who is known as Emperor Montoku. The successor of Montoku was the third son of Emperor Nimmyō, Prince Tokiyasu.