Further, the division of the early Dynastic polity period, which started in early 10th century, and the late Dynastic polity period, which started in the 1140's, was also proposed by him.
また10世紀初頭に始まる前期王朝国家と11世紀40年代を画期とする後期王朝国家の登場が唱えられるようになった。