Emperor Kammu, (735– 9 April 806) was the 50th emperor of Japan, according to the traditional order of succession. Kammu reigned from 781 to 806, and it was during his reign that Japanese imperial power reached its peak. During his reign capital of Japan was moved Nara (Heijō-kyō) to Nagaoka-kyō in 784. Shortly thereafter, the capital would be moved again in 794 to Heian-kyō, where the palace was named Heian no Miya (平安宮, “palace of peace/tranquility”).
Kammu was an active emperor who attempted to consolidate government hierarchies and functions. Kammu appointed Sakanoue no Tamuramaro (758–811) to lead a military campaign against the Emishi. Kammu was born on 737, on 773 he recieved the title of crown prince.
Kammu died at the age of 70. Kammu’s reign lasted for 25 years. The years of Kammu’s reign are more specifically identified by more than one era name (nengō)