Sadahisa served the Ogigayatsu-Uesugi and built Takiyama castle. After the Uesugi defeat at Kawagoe in [[1545]], Oishi was made to accept the authority of the [[Go-Hojo clan|Hôjô]]. He was murdered and was succeeded by [[Hojo Ujimasa|Hôjô Ujimasa's]] 2nd son [[Hojo Ujiteru|Ujiteru]]. After the fall of the Hôjô, his sons Yoshinaka and Sadakatsu came to work for [[Okubo Nagayasu]].
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Sadahisa served the [[Ogigayatsu-Uesugi clan]] and built [[Takiyama castle]]. After the Uesugi defeat at [[siege of Kawagoe|Kawagoe]] in [[1545]], Oishi was made to accept the authority of the [[Go-Hojo clan|Hôjô]]. He was murdered and was succeeded by [[Hojo Ujimasa|Hôjô Ujimasa's]] 2nd son [[Hojo Ujiteru|Ujiteru]]. After the fall of the Hôjô, his sons [[Oishi Yoshinaka|Yoshinaka]] and [[Oishi Sadakatsu|Sadakatsu]] came to serve [[Okubo Nagayasu|Ôkubo Nagayasu]].