It is in the latter half of the 8th century Bajo 7 years (776), along with the northward movement of the northeastern management of the Imperial Court, that the land of "Isawa" in the middle of the Kitakami River basin appears in history. At this time, the target of attack by the Ritsury 政府 government has been squeezed into the "place of the gallstones", the base of the country's largest Emishi force, and from then on until the enclave of 20 years (801), the ancient state And the battle with the Emishi army centering on Aru Riki (Attaru) and Maternity (Mole) develops.