Emperor Heizei was the 49th emperor of Japan, reigning from 806 to 809 AD. He was born in 774 and was the son of Emperor Kanmu. His reign is noted for the promotion of Buddhism and the establishment of the Nara period's cultural influences. During his short rule, Heizei faced political challenges, including conflicts with powerful court officials. In 809, he abdicated the throne in favor of his younger brother, Emperor Saga, and retired to a temple. His reign, though brief, contributed to the ongoing development of the imperial court and its cultural landscape.