The main branch of the Koga Family had long served concurrently as the leader of Genji and chief of both the Junnain Palace and Shogakuin College, but such a position was removed by Shogun Yoshimitsu ASHIKAGA of Samurai-Genji (the Gen clan as samurai families) during the Muromachi period.
久我家嫡流は長く源氏長者や淳和院・奨学院両院別当を兼任したが、室町時代、武家源氏の将軍足利義満にその地位を奪われた。