Growth of Small Principalities in Germany. --Changes in the Lehen, or Royal Estates. --Diet at Forchheim. --The Frank Duke, Konrad, chosen King. --Events of his Reign. --The Saxon, Henry the Fowler, succeeds him. --Henry's Policy towards Bavaria, Lorraine and France. --His Truce with the Hungarians. --His Military Preparations. --Defeat of the Hungarians. --Henry's Achievements. --His Death. --Coronation of Otto. --His first War. --Revolt of Duke Eberhard and Prince Henry. --War with Louis IV. of France. --Otto's Victories. --Henry pardoned. --Conquest of Jutland. --Otto's Empire. --His March to Italy. --Marriage with Adelheid of Burgundy. --Revolt of Ludolf and Konrad. --The Hungarian Army destroyed. --The Pope calls for Otto's Aid. --Otto crowned Roman Emperor. --Quarrel with the Pope. --Third Visit to Italy. --His Son married to an Eastern Princess. --His Triumph and Death. [Sidenote: 912.] When Ludwig the Child died, the state of affairs in Germany had greatly changed. The direct dependence of the nobility and clergy upon the Emperor, established by the political system of Charlemagne, was almost at an end; the country was covered with petty sovereignties, which stood between the chief ruler and the people. The estates which were formerly given to the bishops, abbots, nobles, and others who had rendered special service to the Empire, were called _Lehen_, or "liens" of the monarch (as explained in Chapter X.); they were granted for a term of years, or for life, and afterwards reverted to the royal hands. In return for such grants, the endowed lords were obliged to secure the loyalty of their retainers, the people dwelling upon their lands, and, in case of war, to follow the Emperor's banner with their proportion of fighting men. So long as the wars were with external foes, with opportunities for both glory and plunder, the service was willingly performed; but when they came as a consequence of family quarrels, and every portion of the empire was liable to be wasted in its turn, the Emperor's "vassals," both spiritual and temporal, began to grow restive. Their military service subjected them to the chance of losing their _Lehen_, and they therefore demanded to have absolute possession of the lands. The next and natural step was to have the possession, and the privileges connected with it, made hereditary in their families; and these claims were very generally secured, throughout Germany, during the reign of Karl the Fat. Only in Saxony and Friesland, and among the Alps, were the common people proprietors of the soil. [Sidenote: 912. THE WARS OF KING KONRAD.]