Nasir ud-din Muhammad Humayun (1508-56) was the second Mughal emperor who ruled present-day Afghanistan, Pakistan and parts of northern India from 1530-40 and again from 1555-56. Like his father, Babur, he lost his kingdom early, but with Persian aid, he eventually regained a larger one. On the eve of his death in 1556, the Mughal Empire spanned almost one million square kilometers.