In 1491, however, Masatomo ASHIKAGA died and an internal conflict arose within the household of the Horikoshi Kubo, where Chachamaru ASHIKAGA was believed to murder his younger brother, thus leading to the steady decline in power of the Horikoshi Kubo.
しかし1491年に足利政知が死去すると、堀越公方家は内紛を起こし、足利茶々丸が弟を殺害するなど、その勢力は衰退の一途を辿る。