In the late Middle Ages, the Ouchi clan made secondary use of the Kurumazuka Tomb and Dainichi Tomb in connection with Myoken faith (Hokuto faith) in order to strengthen their own political voice in Suo Province. They also unified and strengthened their ritual rights within the clan by moving the bases of Myoken faith that existed all over the country to Kouryuji Temple and Jofukuji Temple in the Ouchi Basin, where they were based.