Frederic died in 1250; and from this year we may date both the disruption of the Empire and the decadence of the free Italian commune. What he had failed to effect, with the united power of Sicily and Germany behind him, was accomplished by a score of petty local dynasties. At Milan the Visconti completed the enslavement which the Delia Torre had first planned; at Verona it was the Scaligeri who entered on the imperial inheritance; at Ferrara, the Este; at Padua the Carrara; at Mantua, the Gonzaga. The tide of despotism rose slowly but surely, until in the fifteenth century Venice alone remained to remind Italy of the possibility of freedom. It is to Germany, rather than Italy or Flanders, that we must look for the last and perhaps the most fruitful phase in the development of medieval town life. Free institutions were acquired by the German towns comparatively late; and although it was the Lombard commune which they aspired to reproduce, they never succeeded in securing so large a measure of independent power, or in making themselves the capitals of petty States. The Hohenstauffen, like the early Capets, were sensible of the advantages to be gained by alliance with the Third Estate; but Frederic II was obliged to renounce the right of creating free imperial cities within the fiefs of the great princes; and most towns were left to bargain single-handed with their immediate lords. Shut off from any prospects of territorial sovereignty, the towns, even those which held from the Empire, were also excluded from the Diet until the close of the fifteenth century. Trade afforded the only outlet for their activities. But in trade they engaged with such success that, by the close of the Middle Ages, Augsburg rivalled Florence as a centre of cosmopolitan finance, and the Baltic towns had developed a commerce comparable to that of the Mediterranean. It was the Baltic trade which gave birth to a new form of municipal league, the famous Hansa. The nucleus of this association was an alliance formed between Lubeck and Hamburg to protect the traffic of the Elbe. Other cities were induced to affiliate themselves, and in 1299 the Hansa absorbed the older Gothland League of which Wisby was the centre. By the year 1400 there were upwards of eighty Hanseatic cities, lying chiefly in the lower Rhineland, in Saxony, in Brandenburg, and along the Baltic coast; but the commercial sphere of the League extended from England to Russia and from Norway to Cracow.