 Complete the following phrase:  During the Bakumatsu period, he entered the administration of the Tokugawa shogunate, first as Sōshaban Master of Ceremonies in 1858, as Jisha-bugyō in 1861, then as Rōjū Senior Councilor in 1862 under Shōgun Tokugawa Ienari. His court rank was correspondingly increased to Lower 4th. In 18631864 he participated in the discussions within Edo Castle on the ending of Japans national isolation policy and the signing of the unequal treaties with the western powers. Dismissed as Rōjū on July 12, 1864, he was reappointed again on November 26, 1865. In 1866, he participated in the 