徳川斉昭
When the succession problem of 14th Shōgun arose, he delegated his retainer Hashimoto Sanai to Kyoto in support Tokugawa Yoshinobu, the lord of Hitotsubashi-Tokugawa family. However, with the accession of Ii Naosuke to the position of "Tairō", Yoshinobu's faction was defeated and Tokugawa Iemochi (of the Kishu-Tokugawa family) became Shōgun. The Ii clan of Hikone Domain and the Echizen-Matsudaira clan of Fukui Domain had a strong enmity for several generations, and relations between the "Tairō" worsened further after Ii pushed through the ratification of Treaty of Amity and Commerce between US and Japan without acceptance by Emperor Kōmei. Infuriated, Yoshnaga intruded to Edo castle with Tokugawa Nariaki to protest against Naosuke's actions. On 5 July 1858, he was forced to resign as "daimyō" of the Fukui Domain as part of the Ansei purge. At this time, he took the name of "Shungaku".