According to the "Nihonshoki," and other historical books, in 114, Prince Oousu ran away because he was afraid of the order, the Emishi Seito (the conquest of Emishi, who were a group of people living in the northern part of land) and was then confined in Mino Province.
景行天皇40年、蝦夷征伐の命を恐れて逃亡し、美濃国に封ぜられたという。