Emperor Tenmu Japanese emperors 2019.09.04 2019.07.03 The 40th Emperor of Japan. Emperor Tenmu inherits the Y gene The period of reign 672 – 686 Another name 天武天皇(Emperor Tenmu) 大海人(Ooama)天渟中原瀛真人天皇(Amanonunaharaokinomahitonosumeramikoto)浄御原天皇 Mausoleum of Emperor Tenmu