The Tango region where the mountain range is located had close contacts with the Asian continent from ancient times, and immigrants were engaged in metal work; with their advanced technique in metal refining, and having accumulated a large fortune, those who recognized this in the capital sent an army to pillage the wealth, and rule the region.
大江山の位置する丹後地方は古くから大陸との交流が深く、渡来人は高度な金属精錬技術により大江山で金工に従事、多くの富を蓄積していた、これに目を付けた都の勢力は兵を派遣、富を収奪し支配下に置いた。