In 1517, when the Hara clan lost Oyumi-jo Castle as a result of losing a battle against Yoshiaki ASHIKAGA, Taneyoshi relocated himself to Koganekurigasawa-jo Castle, which was under the Hara clan's power, to provide Tanekiyo HARA with formal protection.
永正14年（1517年）、原氏が足利義明に敗れて小弓城を失うと、胤吉は原氏の勢力下にあった小金栗ケ沢城に移って原胤清を迎え入れた。