Later the Ashikaga family, a branch family of the Minamoto clan established Muromachi bakufu, and partly because of the expansion of the power of bushi (warriors) and the decline of the authority and power of the Emperor, reigned over Japan as Seii Taishogun (literally, "great general who subdues the barbarians") and conducted foreign affairs, domestic administration, and military affairs over 15 generations for 240 years.
後に源氏の分家である足利家は室町幕府を開き、武士の勢力の伸張と天皇家の権威・権力の衰退にも助けられ、15代240年にわたり征夷大将軍として日本に君臨し、外交、内政、軍事を差配した。