According to the former academic theories by Motohisa YASUDA, the master and servant relationship between the local bushidan and toryo of bushi of Seiwa-Genji (Minamoto clan) began from the time of the Gosannen War (the Later Three Years' War) of MINAMOTO no Yoshiie, but the power of Yoshiie to be master over his retainers seen in "Oshu-gosannen-ki" (A Chronicle of Later Three Year's War in Oshu) was connected with samurai in Kyoto.
安田元久などの旧来の学説では、源義家の後三年の役の頃から、「武士の棟梁」たる清和源氏と、在地武士団との主従関係が生まれ始めたとするが、『奥州後三年記』に見える義家の郎党の主力は京武者コネクションである。