This leader demanded Martin Luther come forward at the Diet of Worms, although he later tolerated Protestantism in the Peace of Augsburg.
Juan de Padilla led the Revolt of the Comuneros against this ruler. This monarch released the princes John Frederick and Phillip in the Peace of Passau, despite having won the Battle of M?hlberg against the Schmalkaldic League. This ruler destroyed the French army of Francis I in the Battle of Pavia. That battle was part of the Italian Wars, which were ended by the Treaty of Madrid. This leader demanded Martin Luther come forward at the Diet of Worms, although he later tolerated Protestantism in the Peace of Augsburg. For 10 points, name this Hapsburg ruler of Spain and the Holy Roman Empire, who reigned in that latter role from 1519 until 1556.
Juan de Padilla led the Revolt of the Comuneros against this ruler.
Charles V of the Holy Roman Empire [or Charles I of Spain; prompt on Charles]