Emperor Tenji

Emperor Tenji (天智天皇, Tenji-tennō, 626 – January 7, 672), known first as Prince Katsuragi (葛城皇子, Katsuragi no Ōji) and later as Prince Nakano Ōe (中大兄皇子, Nakano Ōe no Ōji) until his accession, was the 38th emperor of Japan who reigned from 668 to 671. He was the son of Emperor Jomei and Empress Kōgyoku (Empress Saimei), and his children included Empress Jitō, Empress Genmei, and Emperor Kōbun.

In 645, Tenji and Fujiwara no Kamatari defeated Soga no Emishi and Iruka. He established a new government and carried out political reforms. He then assumed real political power as the crown prince of both the Kōtoku and Saimei Emperors. Despite the death of Emperor Saimei, he did not accede to the throne for seven years, and came to the throne after the relocation of the capital to Ōmi in 668. He created Japan's first family register, the Kōgo Nenjaku, and the first code of law, the Ōmi Code.