He was a member of the Imagawa clan, a branch family of the Kira clan that was in a collateral line with the Ashikaga clan originating from the Kawachi-Genji (Minamoto clan), which was one of the Seiwa-Genji (Minamoto clan originated from the Emperor Seiwa).
家系は清和源氏の一家系・河内源氏の流れを汲む足利氏の傍流吉良氏の分家にあたる今川氏。