The Meiji Restoration consolidated the political system under the Emperor of Japan with practical abilities. The shogun and daimyo were abolished. Their domains were returned to the emperor. Power was mainly transferred to a group of people called the Meiji oligarchy and the Genrō who helped restore imperial power. The Genrō were retired senior statesmen and informal advisers to the emperor. All Genrō except Saionji Kinmochi were descendants of medium or lower ranking samurai families from Satsuma and Chōshū. They were instrumental in overthrowing the Tokugawa Shogunate in the Boshin War (1868–1869).