Mizuno clan
In 1767, Yamagata Domain was assigned to the Akimoto clan, formerly of Kawagoe Domain, who ruled for four generations until 1845. During the Bakumatsu period, the domain was assigned to its final rulers, the Mizuno clan. It was now reduced to only 50,000 "koku". Mizuno Tadakiyo served as "Jisha-bugyō" and "wakadoshiyori" in the shogunal administration and in 1862, became a "rōjū" in the service of "Shōgun" Tokugawa Iemochi.