According to Lineage Sects of Noble and Humble, during the period of the generations from Arimitsu to the fourth head of the clan (the early Kamakura period), the Mutsu Ishikawa clan seemed to have promoted separation of the clan and the illegitimate lineage, have built castles and residents and have posted managers and lords of the manors of the clan in hamlets in the Ishikawa village.
尊卑文脈によれば、有光～四代目の世代（鎌倉前期）の頃に、陸奥石川氏は一族・庶流の分立を進め、城・館を築き石川庄の村々に一族の地頭を配置していったと思われる。