Event and Process in the Founding of Japan: The Horserider Theory in Archeological Perspective was published by Walter Edwards in the journal of Japanese studies. Edwards mentions that problems of the Horserider theory were published by western and Japanese historians. Horserider theory was published by Egami Namio that considered horseriding people standed Yamato court because of their conquest or collaboration with an original court. The reaction of Japanese societies were negative both historians and archeologists because Egami's idea was inconsistent. Gari Ledyard published an advanced version of the horserider theory based on historical background in Northern Asia. He followed Western archeologists who were interested in anthropology