Tadasuke was a younger brother of Okubo Tadayo. He fought in a number of notable battles for Tokugawa Ieyasu (including Mikatagahara and Nagashino) and came to hold Numazu in Suruga province in 1601.
References
- Initial text from Sengoku Biographical Dictionary (Samurai-Archives.com) FWSeal & CEWest, 2005