He was the Imagawa clan, a branch family of the Kira clan which was a cadet family of the Ashikaga clan whose ancestor was MINAMOTO no Yoshikuni, a son of MINAMOTO no Yoshiie who was Chinju-fu Shogun (Commander-in-Chief of the Defense of the North) and the head of the Kawachi-Genji clan (Minamoto clan), a branch family of the Seiwa-Genji (Minamoto clan).
家系は清和源氏の一家系　河内源氏の棟梁　鎮守府将軍源義家の子　源義国を祖とする足利氏の一門　吉良氏の庶家　今川氏。