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Tadakazu was a son of [[Okubo Tadahiro]]. He served [[Matsudaira Hirotada]] and [[Tokugawa Ieyasu]] and was active in the latter's struggles against the monto of [[Mikawa province|Mikawa]] after [[1561]]. While the young Ieyasu was a hostage of the [[Imagawa clan|Imagawa]], Tadakazu worked effectively to help keep his clan together in his absence.  

Tadakazu was a son of [[Okubo Tadahiro (Sengoku)|Okubo Tadahiro]]. He served [[Matsudaira Hirotada]] and [[Tokugawa Ieyasu]] and was active in the latter's struggles against the monto of [[Mikawa province|Mikawa]] after [[1561]]. While the young Ieyasu was a hostage of the [[Imagawa clan|Imagawa]], Tadakazu worked effectively to help keep his clan together in his absence.  

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