Emperor Heizei (平城天皇, Heizei-tennō; 773 – August 5, 824), also known as Heijō-tennō, was the 51st emperor of Japan, according to the traditional order of succession. Heizei's reign lasted from 806 to 809.
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Traditional narrative
Heizei was the eldest son of the Emperor Kanmu and empress Fujiwara no Otomuro. Heizei had three empresses and seven sons and daughters.
Heizei is traditionally venerated at his tomb; the Imperial Household Agency designates Yamamomo no Misasagi (楊梅陵, Yamamomo Imperial Mausoleum), in Nara, as the location of Heizei's mausoleum. The site is publicly accessible. Although one of the largest kofun monuments in Japan, archaeological investigations in 1962–1963 indicate that it was constructed in the early 5th century, and that portions of it were destroyed during the construction of Heijō-kyō, calling into question the designation by the Imperial Household Agency.