In the middle of the seventh century, ABE no Hirafu and others made expeditions and it is believed that they reached as far as present-day Akita and Tsugaru regions or even further North.
7世紀半ばに阿倍比羅夫らが遠征し、現在の秋田や津軽地方、さらにその北方に至ったとされる。