After the turmoil that followed his adoptive father's death had subsided, he became the head of the Keicho family, and he fought against Sumimoto HOSOKAWA, born into the family of the provincial constable of Awa, and the adopted son of Masamoto, in what is called the Battle of the Two HOSOKAWAS, fulfilling his role as Kanrei.
養父・政元が殺害された後の混乱を経て京兆家の家督を継ぎ、阿波国守護家出身で同じく政元の養子であった細川澄元と両細川の乱と呼ばれる抗争を長期にわたって繰り返しながらも管領として幕政を握り続けた。