After his death, the other members of the Council of Five Regents were unable to keep the ambitions of Tokugawa Ieyasu in check. Two of Hideyoshi's top generals, Katō Kiyomasa and Fukushima Masanori, had fought bravely during the war but returned to find the Toyotomi clan castellan Ishida Mitsunari in power. He held the generals in contempt, and they sided with Tokugawa Ieyasu. Hideyoshi's underage son and designated successor Hideyori lost the power his father once held, and Tokugawa Ieyasu was declared "shōgun" following the Battle of Sekigahara in 1600.