She supplied the people of Italy, France and Germany with those commodities with which the crusaders by their intercourse with more refined nations had become acquainted. The possession of many Eastern ports and the maintenance of a powerful navy made it possible for the Venetians to retain their monopoly for several centuries. The growth of commerce in Central Europe was but slow, owing to the dangers to which it was exposed in those days of feudalism. The mountain fastnesses of robber knights, which controlled every road and navigable river, were so many toll-gates at which the wayfaring merchant was stopped to pay tribute. In time this system of plunder grew to such an extent that hundreds of feudal lords relied upon it for their support. Such a tax upon commerce greatly enhanced the value of all commodities, and this deplorable state of things lasted until the cities made their power felt by forming alliances for mutual protection. One of these alliances, the Rhenish League, comprised in time seventy towns, and the ruins of the strong castles destroyed by its forces still exist along the Rhine, picturesque memorials of these lawless times. Perhaps the most powerful commercial union of the middle ages was the Hanseatic League. To protect their commerce, the cities of Hamburg and Lubeck formed about the middle of the thirteenth century an alliance for mutual defense. The advantages derived from this union attracted other towns to the confederacy. In a short time about eighty of the largest cities lying between the Baltic and the Rhine joined this famous league, which in time became so formidable that its alliance was courted and its enmity was dreaded by the greatest monarchs. The League divided its territory into several districts. Its members, like railway associations of the present day, made their own laws, and met for this purpose at regular intervals in the city of Lubeck. The original object of the League, mutual assistance against outside attacks, was soon lost sight of, and its constantly growing power was used to obtain still greater commercial privileges in the adjoining countries, and even to force their rulers to concede to its members a commercial monopoly. In 1361 a controversy arose between the League and the King of Denmark, which led to a long and bitter war between them. This war was participated in by no less than seventy-seven cities on the part of the League. It terminated in 1370, leaving the Hansa master of the situation. For many years after this the League exerted its power in Denmark, Sweden and Norway, and the rulers of these countries were compelled to respect the wishes and even submit to the orders of these proud merchants. The countries bordering on the Baltic Sea remained the domain of the League for several centuries. They gathered there immense quantities of raw material, which they sold in the various ports of Europe. The influence of the League even reached as far as Novgorod in the east and London in