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Wiki information Heizei:
Emperor Heizei, 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.
Daidō was a Japanese era name after Enryaku and before Kōnin. This period spanned the years from May 806 through September 810. The reigning emperors were Heizei-tennō and Saga-tennō.