Ii Naosuke
Yorinaga Matsudaira was the eighth son of Matsudaira Yoritoshi, the former "daimyō" of Matsuyama Domain in Shikoku. His mother, Chiyoko, was the daughter of Ii Naosuke and his wife was the daughter of Tokugawa Akitake, head of the Mito branch of the Tokugawa clan.