According to an entry of the Eleventh Month, 12th, 1185 of "Azuma Kagami," it was commonly believed among scholars in the old days that the establishment of provincial constable and manager and lord of manor by Yoritomo was realized due to Hiromoto's proposal.
『吾妻鏡』1185年（文治元年）11月12日条により、頼朝が守護・地頭を設置したのも広元の献策によるとよく言われ、研究者の間でも古くはそう理解されてきた。