お家騒動
In 1686, the domain faced a succession crisis and "O-Ie Sōdō" with the removal of Matsudaira Tsunamasa due to insanity was reduced from 475,000 "koku" to 250,000 "koku". A number of the later "daimyō" of Fukui were adopted into the clan from the Hitotsubashi-Tokugawa family, one of the "Gosankyō", the three lesser branches of the Tokugawa clan.