Given the tumultuous history of the disturbances in the Jijo and Juei eras, the Kamakura bakufu--made up primarily of samurais from the eastern provinces, having its stronghold in Kamakura, and having Minamoto no Yoritomo as its leader--exerted control over assignments of provincial governors and estate stewards in several provinces, mainly in the east, and held the power to police those domains; in the west, however, they had no real control, whereas the Imperial Court's power in the West remained considerable, and thus the shogunate and the Court were stuck as joint rulers of Japan.
治承・寿永の乱の過程で、鎌倉を本拠に源頼朝を棟梁として東国武士を中心に樹立された鎌倉幕府では、東国を中心に諸国に守護、地頭を設置し、警察権を掌握していたが、西国は支配しきっておらず依然として朝廷の力は強く、幕府と朝廷の二頭政治の状態にあった。