Although a staunch supporter of the Tokugawa shogunate, Yôdô later shifted his allegiance to the restoration of Imperial Rule. Although forced into retirement in 1859 during the Ansei Purge, Yôdô still managed to control han politics for a time, before retiring more completely from politics sometime prior to his death in 1872. Although he never met Sakamoto Ryôma, it was Yôdô who passed on Ryôma's memorial to Shogun Tokugawa Yoshinobu, urging the shogun to resign peacefully and cede political control back to the throne, which he did.
- Hillsborough, Romulus. RYOMA- Life of a Renaissance Samurai. Ridgeback Press, 1999
- Jansen, Marius B. Sakamoto Ryoma and the Meiji Restoration. Columbia University Press, 1994.
- Ishin Shiryô Kôyô 維新史料綱要, vol 2 (1937), 43.
- Ishin Shiryô Kôyô 維新史料綱要, vol 3 (1937), 143.