Tadasuke was a younger brother of [[Okubo Tadayo]]. He fought in a number of notable battles for Tokugawa Ieyasu (including [[Battle of Mikatagahara|Mikatagahara]] and [[Battle of Nagashino|Nagashino]]) and came to hold Numazu in [[Suruga province|Suruga province]] in [[1601]].
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Tadasuke was a younger brother of [[Okubo Tadayo]]. He fought in a number of notable battles for Tokugawa Ieyasu (including [[Battle of Mikatagahara|Mikatagahara]] and [[Battle of Nagashino|Nagashino]]) and came to hold [[Numazu han]], in [[Suruga province|Suruga province]], in [[1601]], with a ''[[kokudaka]]'' of 20,000 ''[[koku]]''.<ref>Cesare Polenghi, ''Samurai of Ayutthaya: Yamada Nagamasa, Japanese warrior and merchant in early seventeenth-century Siam''. Bangkok: White Lotus Press (2009), 13.</ref>