The Taika Reforms (大化の改新, Taika no Kaishin) were a set of doctrines established by Emperor Kōtoku in the year 646. They were written shortly after the death of Prince Shōtoku, and the defeat of the Soga clan, which united Japan. Crown Prince Naka no Ōe (who would later reign as Emperor Tenji), Nakatomi no Kamatari, and Emperor Kōtoku jointly embarked on the details of the Reforms. Emperor Kōtoku then took the name "Taika" (大化), or "Great Reform".