Pepin was succeeded in 768 A.D. by his two sons, one of whom, Charlemagne, three years later became sole king of the Franks. Charlemagne reigned for nearly half a century, and during this time he set his stamp on all later European history. His character and personality are familiar to us from a brief biography, written by his secretary, Einhard. Charlemagne, we learn, was a tall, square-shouldered, strongly built man, with bright, keen eyes, and an expression at once cheerful and dignified. Riding, hunting, and swimming were his favorite sports. He was simple in his tastes and very temperate in both food and drink. Except when in Rome, he wore the old Frankish costume, with high-laced boots, linen tunic, blue cloak, and sword girt at his side. He was a clear, fluent speaker, used Latin as readily as his native tongue, and understood Greek when it was spoken. "He also tried to learn to write and often kept his tablets and writing book under the pillow of his couch, that, when he had leisure, he might practice his hand in forming letters; but he made little progress in this task, too long deferred and begun too late in life." [14] For the times, however, Charlemagne was a well-educated man--by no means a barbarian. [Illustration: CHARLEMAGNE (Lateran Museum, Rome) A mosaic picture, made during the lifetime of Charlemagne and probably a fair likeness of him.] CONQUEST AND CONVERSION OF THE SAXONS, 772-804 A.D. Much of Charlemagne's long life, almost to its close, was filled with warfare. He fought chiefly against the still-heathen peoples on the frontiers of the Frankish realm. The subjugation of the Saxons, who lived in the forests and marshes of northwestern Germany, took many years. Charlemagne at the head of a great army would invade their territory, beat them in battle, and receive their submission, only to find his work undone by a sudden rising of the liberty-loving natives, after the withdrawal of the Franks. Once when Charlemagne was exasperated by a fresh revolt, he ordered forty-five hundred prisoners to be executed. This savage massacre was followed by equally severe laws, which threatened with death all Saxons who refused baptism or observed the old heathen rites. By such harsh means Charlemagne at length broke down the spirit of resistance among the people. All Saxony, from the Rhine to the Elbe, became a Christian land and a permanent part of the Frankish realm. [Illustration: THE IRON CROWN OF LOMBARDY A fillet of iron, which, according to pious legend, had been beaten out of one of the nails of the True Cross. It came to the Lombards as a gift from Pope Gregory I. as a reward for their conversion to Roman Catholicism. During the Middle Ages it was used to crown the German emperors kings of Italy. This precious relic is now kept in a church at Monza in northern Italy.] CONQUEST OF THE LOMBARDS, 774 A.D.