With the order of Emperor Keiko, the Emishi were forbidden to live within Kinai and were sent to five provinces, namely, Harima Province, Sanuki Province, Iyo Province, Aki Province, and Awa Province, and became the origin of Saekibe.
「畿内に住むべからず」との景行天皇の命で、播磨国・讃岐国・伊予国・安芸国・阿波国の5ヶ国に送られたのがその祖である。