![The Ancient Emishi Hero Aterui and the 38-Year Tohoku War [Part 2] | Did Aterui End His Life in Present-Day Osaka Prefecture?](https://jp.neft.asia/wp-content/uploads/2026/02/eeb260cc73c18309bc819a9df185f46e-600x420.jpg.webp)
The end of the Seii War from 789 to 811: After the Ikomaro Rebellion, the Imperial Court further increased military pressure on the Emishi, frequently resorting to large-scale military force.
![The Ancient Emishi Hero Aterui and the 38-Year Tohoku War [Part 2] | Major Battles in Ancient Tohoku and Their History](https://jp.neft.asia/wp-content/uploads/2026/02/8f4979ebfa4c5bcbf24ba36c0826a52a-600x420.jpg.webp)
Why did the ancient Tohoku region become a battlefield? As we have seen, Aterui and the other Emishi were in a state of prolonged combat with the Yamato army, but why did the Tohoku region have to become a battlefield in the first place?.
Introduction Although we generally refer to the term "Japan," it is well known that its boundaries have changed over time. For example, Hokkaido was not officially designated as Japanese territory until 1869.
