Whether these legendary stories are based on historical truth or not, it seems to be true that during the middle of the Tumulus period, the captives of the eastern countries were moved to the five provinces mentioned above and were set up and organized as Saeki be.
これらの伝承の史実性はともかくとして、古墳時代の中頃（5-6世紀）には、東国人の捕虜を上記5ヶ国に移住させ、佐伯部として設定・編成したのは事実のようである。