Originally, he was the legitimate successor of Kogakubo, but a daughter of the Hojo clan, who was a concubine of Haruuji, gave birth to Yoshiuji ASHIKAGA, and as a result he was persecuted by the Hojo clan who wanted Yoshiuji to be the head of the family.
本来は古河公方の正統な後継者の立場だったが、晴氏の側室である北条氏の娘に足利義氏が産まれたため、義氏を当主にしたい北条氏により迫害を受けた。