Initially, Sakimori was recruited in Togoku (eastern country, eastern provinces, Kanto provinces), but they were recruited only in Kyushu after 757 when the system of Yamato kingshio was established.
また当初、防人は東国から徴発されたが、（ヤマト王権の体制が固まった）757年以降は九州からのみの徴用となっている。