Of all administrations in the military government, each samurai authority of Kamakura, Muromachi, and Tokugawa were set up by force and could be traced back to the establishment by MINAMOTO no Yoritomo; he started the bakufu by arriving in power of seii taishogun (literally, "great general who subdues the barbarians") in the form of being entrusted by the Imperial Court, achieved decentralized governance, called a "feudal system," and adopted a form of coalition government of samurai who held sway over their region as a local feudal lord.
そのうち鎌倉、室町、徳川の各武家権力は、武力により政権を樹立し、源頼朝が確立したが、形式上朝廷から任ぜられる形で征夷大将軍の位に付く事で幕府を開き、封建制とも呼ばれる分権的な統治を行い、地方領主として地域の実効支配権を持つ武士の連合政権の形をとった。