メキシコ皇帝
Emperor Franz Joseph I of Austria ruled over the Kingdom for the rest of its existence. The office of Viceroy was abolished and replaced by a Governor-General. The office was initially assumed by Field Marshal Radetzky, upon his retirement in 1857 it passed it to Franz Joseph's younger brother Maximilian (who later became Emperor of Mexico), who served as Governor-General in Milan from 1857 to 1859.