Jakko was appointed as the Local Magistrate of the district, and left Oiso to stabilize people's livelihood by pioneering the interior of the Koma County, which was a back-country at that time (subsequently, this influenced the samurais of Togoku).
その郡の大領（郡司）に任命されて、大磯を去り、同郡に下って当時荒野であった高麗郡内を開拓して民生を安定させた（その後、東国の武士に影響を与えた）。