The Army clan which worked for military arts and force as a family business, developed into military nobles, and they established a gradual relation of master and servant with the local rich farmers when they transferred as a local official (Zuryo).
武芸・武力を家業とする兵の家が軍事貴族へと発展し、地方官（受領）として赴任した際に現地の富豪百姓らとゆるやかな主従関係を結んだ。