, also called Okudaira Sadamasa (奥平貞昌), was a Japanese daimyō of the Sengoku and early Edo periods. Nobumasa's family considered their origins to have been associated with Mikawa Province. The clan was descended through the Akamatsu from the Murakami-Genji.

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, also called Okudaira Sadamasa (奥平貞昌), was a Japanese daimyō of the Sengoku and early Edo periods. Nobumasa's family considered their origins to have been associated with Mikawa Province. The clan was descended through the Akamatsu from the Murakami-Genji. Biography When Nobumasa was born, he was called Okudaira Sadamasa (奥平貞昌). He was the son of Okudaira Sadayoshi, an influential local figure in Mikawa. The Okudaira family were originally retainers of the Tokugawa, but were forced to join Takeda Shingen. In 1573, after Shingen died and Katsuyori assumed leadership of the Takeda clan, Okudaira Sadamasa walked his men out of Tsukude Castle and rejoined the Tokugawa. Katsuyori had Sadamasa's wife and brother – hostages to the Takeda – crucified for what the Takeda construed as betrayal. Tokugawa allowed Nobumasa to marry his eldest daughter, Kamehime ; and he was given Nagashino Castle. Sadamasa was entrusted with the defense of Nagashino Castle by Tokugawa Ieyasu.

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