The was one of several major families descended from the Seiwa Genji, and numbered among the chief enemies of the Hojo clan regents, and later the Ashikaga shogunate. The common ancestor of the Nitta, Minamoto no Yoshishige (1135 – 1202), was the elder brother of Minamoto no Yoshiyasu, the common ancestor of the Ashikaga clan. Yoshishige was the a landowner in the Nitta District of Kozuke Province in present-day Gunma Prefecture. Yoshishige supported Minamoto no Yoritomo (1147 – 1199) in the Battle of Ishibashiyama of 1180 against the Taira clan.