REFERENCES.--The attention of the student is directed only to the most prominent and valuable works which treat of Luther and the Protestant reformation. All the works are too numerous, even to be decimated. Allusion is made to those merely which are accessible and useful. Among them may be mentioned, as most important, Ranke's History of the Reformation; D'Aubigne's History of the Reformation; Michelet's Life of Luther; Audin's Life of Luther, a Catholic work, written with great spirit, but not much liberality; Stebbing's History of the Reformation; a Life of Luther, by Rev. Dr. Sears, a new work, written with great correctness and ability; Guizot's Lectures on Civilization; Plank's Essay on the Consequences of the Reformation. CHAPTER III. THE EMPEROR CHARLES V. [Sidenote: Charles V.] When Luther appeared upon the stage, the great monarchies of Europe had just arisen upon the ruins of those Feudal states which survived the wreck of Charlemagne's empire. The Emperor of Germany, of all the monarchs of Europe, had the greatest claim to the antiquity and dignity of his throne. As hereditary sovereign of Austria, Styria, Carinthia, and the Tyrol, he had absolute authority in his feudal provinces; while, as an elected emperor, he had an indirect influence over Saxony, the Palatinate, the three archbishoprics of Treves, Mentz, and Cologne, and some Burgundian territories. [Sidenote: Spain and France in the Fifteenth Century.] But the most powerful monarchy, at this time, was probably that of France; and its capital was the finest city in Europe, and the resort of the learned and elegant from all parts of Christendom. All strangers extolled the splendor of the court, the wealth of the nobles, and the fame of the university. The power of the monarch was nearly absolute, and a considerable standing army, even then, was ready to obey his commands. Spain, at the beginning of the sixteenth century, was ruled by Ferdinand and Isabella, who, by their marriage, had united the crowns of Castile and Arragon. The conquest of Granada and the discovery of America had added greatly to the political importance of Spain, and laid the foundation of its future greatness under Philip II.