After MINAMOTO no Yoshie declined, TAIRA no Masamori, who became the first 'choka no soga' (retainers of the imperial family or household called as fangs and claws of imperial family), served as governor of Kingoku (provinces close to Kyoto) (taigoku (major provinces) and 熟国 back then) as well as being the Uma no gon no kami (Provisional Captain of the Right Division of the Bureau of Horses).
源義家の凋落後、「朝家の爪牙」の第一人者となった平正盛は、近国（かつ大国・熟国）の国守を務めると同時に右馬権頭であった。