During the period of the Northern and Southern Courts, the Ashikaga clan was prominent within the Minamoto clan; when the Ashikaga clan leader Takauji ASHIKAGA revolted against the Kenmu administration, the Kuge clan hastened to the Ashikaga camp at the front, and they obtained substantial amounts of territory within Tanba Province and amassed the most power and influence within Tanba Province.
南北朝時代、久下氏は源氏の名門足利氏の棟梁　足利尊氏が建武政権に反旗を翻すと一番に足利軍の陣中に駆けつけたことから、丹波国内に多くの所領を得て丹波国内最有力の勢力を築く。