Emperor Kōmei
Prince Osahito was enthroned as Emperor on 10 March 1846 upon the death of his father. The succession was considered to have been received by the new monarch; and shortly thereafter, Emperor Kōmei is said to have acceded the throne. The years of Kōmei's reign correspond with a period in which Tokugawa Ieyoshi, Tokugawa Iesada, Tokugawa Iemochi, and Tokugawa Yoshinobu were leaders at the pinnacle of the Tokugawa shogunate. On 8 July 1853 US Commodore Matthew Perry arrived with his "Black Ships" to force trade with Japan. The Tokugawa shogunate, which had controlled military and civil affairs in Japan's feudal provinces for some three centuries, proved unable to meet the new challenge of open trade with the West. At the time, Emperor Kōmei still retained only symbolic power at his court in Kyoto. As the shogunate, divided by internal disputes, gradually surrendered sovereignty to the foreign powers, under threat of military force, Emperor Kōmei began to assert himself and regain many of the powers his ancestors had conceded to the Tokugawa clan at the close of the Sengoku ("warring states") period. The Emperor's younger sister, Imperial princess , was married to the Tokugawa "shōgun" Tokugawa Iemochi as part of the Movement to Unite Court and Bakufu. Both the Emperor and his sister were against the marriage, even though he realized the gains to be had from such familial connections with the true ruler of Japan. Emperor Kōmei did not care much for anything foreign, and he opposed opening Japan to Western powers, even as the shogun continued to accept foreign demands.