In fact, however, because barbarians did not adapt themselves to the places they were sent, and had conflicts with and rose against the locals quite often, a petition from Mutsu Province to keep and control barbarians in their original place was created in 811, and was accepted.
しかし、実際には俘囚・夷俘は移配先に馴染めずにたびたび地域との衝突や反乱を起こしたために、弘仁2年（811年）に陸奥国より俘囚を現地に止めて支配を行う旨の奏請が行われて受理された。