The Elector of Saxony and the Landgrave of Hesse, however held out; and such was the condition of the emperor, that he could not immediately attack them. But the death of Francis gave him leisure to invade Saxony, and the elector was defeated at the battle of Muhlhausen, (1547,) and taken prisoner. The captive prince approached the victor without sullenness or pride. "The fortune of war," said he, "has made me your prisoner, most gracious emperor, and I hope to be treated ----" Here Charles interrupted him--"And am I, at last, acknowledged to be emperor? Charles of Ghent was the only title you lately allowed me. You shall be treated as you deserve." At these words he turned his back upon him with a haughty air. [Sidenote: Captivity of the Landgrave of Hesse.] The unfortunate prince was closely guarded by Spanish soldiers, and brought to a trial before a court martial, at which presided the infamous Duke of Alva, afterwards celebrated for his cruelties in Holland. He was convicted of treason and rebellion, and sentenced to death--a sentence which no court martial had a right to inflict on the first prince of the empire. He was treated with ignominious harshness, which he bore with great magnanimity, but finally made a treaty with the emperor, by which, for the preservation of his life, he relinquished his kingdom to Maurice. The landgrave was not strong enough to resist the power of Charles, after all his enemies were subdued, and he made his submission, though Charles extorted the most rigorous conditions, he being required to surrender his person, abandon the league of Smalcalde, implore pardon on his knees, demolish his fortifications, and pay an enormous fine. In short, it was an unconditional submission. Beside infinite mortifications, he was detained a prisoner, which, on Charles's part, was but injury added to insult--an act of fraud and injustice which inspired the prince, and the Protestants, generally, with unbounded indignation. The Elector of Brandenburg and Maurice in vain solicited for his liberty, and showed the infamy to which he would be exposed if he detained the landgrave a prisoner. But the emperor listened to their remonstrances with the most provoking coolness, and showed very plainly that he was resolved to crush all rebellion, suppress Protestantism, and raise up an absolute throne in Germany, to the subversion of its ancient constitution. To all appearances, his triumph was complete. His great rival was dead; his enemies were subdued and humiliated; Luther's voice was hushed; and immense contributions filled the imperial treasury. He now began to realize the dreams of his life. He was unquestionably, at that time, the most absolute and powerful prince Europe has ever seen since Charlemagne, with the exception of Napoleon.