Toshikatsu was a son of Mizuno Nobumoto and was adopted into the Doi family of Mikawa province. He served as an advisor to both Tokugawa Hidetada (with whom he spent his childhood) and Tokugawa Iemitsu, and was highly regarded by the latter. He served at the sieges of Osaka Castle (1614,1615), having been made a daimyô in Shimôsa Province in 1601.
Sons: Toshitaka, Toshinaga, Toshifusa
References
- Initial text from Sengoku Biographical Dictionary (Samurai-Archives.com) FWSeal & CEWest, 2005