Battle of Baekgang
Takayasu castle, an ancient castle on Mount Takayasu, was constructed for defense against Tang dynasty, after Yamato was defeated at the Battle of Baekgang in Korean Peninsula. In 1978, a relic was discovered at the east side of Mount Takayasu, and researchers identified it as a warehouse of Takayasu castle, which was rebuilt after Jinshin War occurred at 673. They held another research at 1999, and discovered a stone wall for 100 meters made of Granite at the point 300 meters away from the top of the mountain. After the discovery, the archaeologists identified that the wall was over ten meters.