By building his home south of the Koromo, Kiyohira (half Emishi himself) demonstrated his intention to rule Oshu without official sanction from the court in Kyoto.
In June 787 Emishi cavalry led by Aterui and More surprised and routed a larger force of Japanese infantry in the Battle of Subuse Village which is now a part of Mizusawa Ward.
Oshu |
The story is based on the classical Japanese Noh theatre drama Ōshū Adachigahara about the demon Onibaba.
Esashi, Iwate, previously a city, now a ward in Ōshū city, Iwate Prefecture
Secondly it was determined to be the center of their realm, Ōshū, as measured from the Shirakawa Barrier in the south to Sotogahama in present day Aomori Prefecture in the north.
In 1409, Higo (Tanegashima) Kiyotoki was given the islands of Yaku and Kuchinoerabu by Shimazu Motohisa, the head of the Ōshū branch of the Shimazu clan, who rivaled the Sōshū branch family.