The Kamakura-kubo family, who were the forefathers of Koga-kubo, ruled the Kanto region for generations from the era of Motouji ASHIKAGA, who was the son of Takauji ASHIKAGA.
古河公方家の祖である鎌倉公方家は、足利尊氏の子の足利基氏以来代々関東を支配していた。