Oishi Sadahisa

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Oishi Sadahisa (大石定久 Ōishi Sadahisa; ?-?) is a servant of the Ogigayatsu-Uesugi branch of the Uesugi, and the builder of the Takiyama Castle (滝山城). After the Uesugi were defeated at Kawagoe during the year of 1545, Oishi accepted the authority of the Hojo. However, the current leader was murdered, and was replace by Hojo Ujimasa's 2nd son Hojo Ujiteru. After the fall of the Hojo, Oishi Yoshinaka and Sadakatsu came to work for Okubo Nagayasu.

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