On January 15, 1191, Yoritomo recommended 10 gokenin, including Tomomasa, for their military exploits and appointed them as governmental officers, so that Tomomasa was promoted to Uemon no jo (third-ranked officer of the Right Division of Outer Palace Guards) from Uhyoue no jo (officer of the Right division of Middle Palace Guards).
12月11日、頼朝は勲功の有る御家人ら十人を挙任し、朝政はその中の一人として右兵衛尉から右衛門尉に転じる。