Ieyasu preserved his strength in Toyotomi's failed attempt to conquer Korea. After Toyotomi's death, Ieyasu seized power in 1600, after the Battle of Sekigahara. He received appointment as "shōgun" in 1603, and voluntarily abdicated from office in 1605, but remained in power until his death in 1616. He implemented a set of careful rules known as the "bakuhan" system, designed to keep the daimyo and samurai in check under the Tokugawa Shogunate.