In 1565, he succeeded in attacking and overthrowing Nagayori MATSUNAGA (name of Nagayori MATSUNAGA after inheriting Naito clan), who was a desire for revenge for the death of his elder brother taking advantage of the confusion after the death of Chokei MIYOSHI.
1565年には三好長慶逝去後の混乱を突いて兄の仇である松永長頼（松永長頼の内藤氏の継承後の名）を攻め滅ぼすことに成功した。