Emperor Heizei Japanese emperors 2019.09.04 2019.07.04 The 51st Emperor of Japan. Emperor Heizei inherits the Y gene The period of reign 806 – 809 Another name 平城天皇(Emperor Heizei) 小殿(Ote)安殿(Ate)奈良帝(Naranomikado)日本根子天推国高彦天皇(Yamatonekoameoshikunitakahikonomikoto) Mausoleum of Emperor Heizei