Gobyōno Kofun

Emperor Tenji (also romanized Tenchi, 626–671) was the 38th emperor of Japan according to the traditional order of succession. Initially known as Prince Kazuraki, and later Prince Naka no Ōe, he was the son of Emperor Jomei and Empress Kōgyoku. After his father's death in 641, a succession dispute emerged between the young Prince Naka and another royal prince, Yamashiro. This was mediated by his mother's ascension to the throne. Naka conspired with a group of aristocrats to assassinate the despotic minister Soga no Iruka in 645. After the assassination, his mother resigned as ruler and Naka served as the crown prince for his uncle and Kōgyoku's brother, Emperor Kōtoku. However, after Kōtoku's death in 654, Kōgyoku reascended the throne as Empress Saimei. She died in 661 amid preparations for an expedition to Korea, where the forces of Tang China and Silla defeated those of Japan. Prince Naka did not immediately ascend to the throne, instead serving as regent for the following seven years. During his term as regent, Naka implemented reforms to the royal court and built up military infrastructure in Kyushu, fearing a Chinese invasion. He moved the royal capital to the Ōmi Ōtsu Palace northeast of Asuka, after which he ascended to the throne as emperor. He established the Daijō-kan (Council of State), appointing his son Prince Ōtomo as the inaugural Daijō-daijin ('prime minister'

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