Emperor Kanmu , or Kammu, 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 the scope of the emperor's powers reached its peak. His reign saw the transition from the Nara period to the Heian period. Born: 737 Died: 806 In office: 781 – January 1, 806 Wiki link