松平定信
The Hisamatsu-Matsudaira clan was founded by Tokugawa Ieyasu's half-brother Hisamatsu Sadakatsu. Due to his close relation to Ieyasu, Sadakatsu was allowed the use of the Matsudaira surname. Eventually, some of the branches of the Hisamatsu-Matsudaira were also allowed the use of the Tokugawa family crest, as well as being formally recognized as Tokugawa relatives ("shinpan"), rather than simply being a "fudai" family. Branches of the Hisamatsu-Matsudaira ruled the Kuwana, Imabari, and Iyo-Matsuyama domains. Famous Hisamatsu-Matsudaira include the political reformer Matsudaira Sadanobu, the final Kyoto Shoshidai Matsudaira Sadaaki, and shogunate politician Itakura Katsukiyo. In the Meiji era, the heads of all the Hisamatsu-Matsudaira branches received titles in the new nobility.