Motonobu was a son of Okabe Hisatsuna and a younger brother of Okabe Masatsuna. He was at first a retainer of Imagawa Ujizane but joined the Takeda after the fall of the Imagawa in 1569. He was installed in Takatenjin castle in Tôtômi province and when Takatenjin fell to the Tokugawa in 1581, Motonobu was killed.
References
- Initial text from Sengoku Biographical Dictionary (Samurai-Archives.com) FWSeal & CEWest, 2005