Emperor Kanmu

, also written as "Kammu", was the 50th emperor of Japan, according to the traditional order of succession. His reign started in 781 and ended in 806.
Kanmu was the first monarch of the Heian period of the history of Japan.
Traditional history.
Before he became the monarch, this prince's personal name ("imina") was .
Prince Yamabe was the eldest son of Prince Shirakabe (later known as Emperor Kōnin). According to the , Yamabe's mother was a descendant of King Muryeong of Baekje.
Kanmu had 16 empresses and consorts, and 32 imperial sons and daughters. Among his sons were Emperor Heizei, Emperor Saga and Emperor Junna.
Events of Kanmu's life.
Before he became the monarch, he was Crown Prince for eight years.
During his reign, Kanmu tried to simplify the hierarchy and the functions of his government.
The capital of Japan was moved from Nara (Heijō-kyō) to Nagaoka (Nagaoka-kyō) in 784. The capital would be moved again in 794 to Kyoto (Heian-kyō).
Kanmu named Sakanoue no Tamuramaro (758-811) to lead a military expedition against the Emishi.
After his death.
According to the Imperial Household Agency, the mausoleum ("misasagi") of Kammu is in Kyoto. The emperor is traditionally venerated at a memorial Shinto shrine at this location.
Eras of reign.
The years of Kammu's reign are identified by more than one era name ("nengō").