Mito Domain
Yorinori succeeded Yoritaka, who retired in 1846. Yorinori acted as an assistant to , the elder brother of Tokugawa Yoshinobu. Yoritaka, who retired as the lord, helped his son be appointed as a sub-assistant. Tokugawa Yoshiatsu was the tenth feudal lord of the Mito Domain, which was the Shishido han's head family.