Yasunaga was a son of Toda Danjô Tadashige. He married an adopted daughter of Tokugawa Ieyasu (the daughter of Hisamatsu Toshikatsu) and was allowed to assume the name 'Matsudaira'. He first saw service at the recapture of Takatenjin castle in Tôtômi in 1581 and during the Sekigahara Campaign (1600) participated in the capture of Ôgaki in Mino province. he was afterwards awarded a string of fiefs that culminated in his transfer to Matsumoto in Shinano province, worth 60,000 koku.
References
- Initial text from Sengoku Biographical Dictionary (Samurai-Archives.com) FWSeal & CEWest, 2005