Over the identity of Ezochishimao Kasha, in the wake of theory put forward by Kimiaki TAKAHASHI in 1981 that Ezochishimao Kasha was a chief of Ainu tribe, new theories were released actively.
夷千島王遐叉の正体を巡っては、高橋公明が1981年、アイヌの部族長説を唱えたことを契機に活発に新説が発表された。