Ōishi Sadahisa (大石 定久; 1 May 1491 – 27 October 1549) was a retainer of the Ogigayatsu-
Uesugi Uesugi (sometimes written ''Uyesugi'') is a Japanese surname. Notable people with the surname include:
People
*Uesugi clan, a Japanese samurai clan
**Uesugi Akisada, (1454–1510), a samurai of the Uesugi clan
**Uesugi Harunori (1751–1822), a Jap ...
branch of the Uesugi, and the builder of
Takiyama Castle (滝山城). After the Uesugi were defeated at
Kawagoe in 1545, Ōishi accepted the authority of the
Hōjō. However, their leader was murdered, and was replaced by
Hōjō Ujimasa's second son
Hōjō Ujiteru
(1540? – August 10, 1590) was a Japanese samurai, who was the son of Hōjō Ujiyasu and lord of Hachiōji Castle in what is now Tokyo.
In 1568, Ujiteru defended Takiyama castle from Takeda Shingen. Later in 1569, Ujiteru and his brother ...
. After the fall of the Hōjō,
Ōishi Yoshinaka and
Sadakatsu came to work for
Okubo Nagayasu.
{{DEFAULTSORT:Oishi, Sadahisa
Uesugi retainers
Samurai
1491 births
1549 deaths
Place of birth unknown
Place of death unknown