Legal in form, in practice sometimes almost absolute, the government of Germany was, like that of other feudal kingdoms, restrained chiefly by the difficulty of coercing refractory vassals. All depended on the monarch's character, and one so vigorous and popular as Frederick could generally lead the majority with him and terrify the rest. A false impression of the real strength of his prerogative might be formed from the readiness with which he was obeyed. He repaired the finances of the kingdom, controlled the dukes, introduced a more splendid ceremonial, endeavoured to exalt the central power by multiplying the nobles of the second rank, afterwards the 'college of princes,' and by trying to substitute the civil law and Lombard feudal code for the old Teutonic customs, different in every province. If not successful in this project, he fared better with another. Since Henry the Fowler's day towns had been growing up through Southern and Western Germany, especially where rivers offered facilities for trade. Cologne, Treves, Mentz, Worms, Speyer, Nürnberg, Ulm, Regensburg, Augsburg, were already considerable cities, not afraid to beard their lord or their bishop, and promising before long to counterbalance the power of the territorial oligarchy. Policy or instinct led Frederick to attach them to the throne, enfranchising many, granting, with municipal institutions, an independent jurisdiction, conferring various exemptions and privileges; while receiving in turn their good-will and loyal aid, in money always, in men when need should come. His immediate successors trode in his steps, and thus there arose in the state a third order, the firmest bulwark, had it been rightly used, of imperial authority; an order whose members, the Free Cities, were through many ages the centres of German intellect and freedom, the only haven from the storms of civil war, the surest hope of future peace and union. In them national congresses to this day sometimes meet: from them aspiring spirits strive to diffuse those ideas of Germanic unity and self-government, which they alone have kept alive. Out of so many flourishing commonwealths, four[199] have been spared by foreign conquerors and faithless princes. To the primitive order of German freemen, scarcely existing out of the towns, except in Swabia and Switzerland, Frederick further commended himself by allowing them to be admitted to knighthood, by restraining the licence of the nobles, imposing a public peace, making justice in every way more accessible and impartial. To the south-west of the green plain that girdles in the rock of Salzburg, the gigantic mass of the Untersberg frowns over the road which winds up a long defile to the glen and lake of Berchtesgaden. There, far up among its limestone crags, in a spot scarcely accessible to human foot, the peasants of the valley point out to the traveller the black mouth of a cavern, and tell him that within Barbarossa lies amid his knights in an enchanted