Beneath the whole mediæval system lay the idea that the land was the only economic basis of wealth. During the earlier Middle Ages this was largely true everywhere, and was specially so in Germany. Each little district produced almost all that it needed for its own wants; and the economic value of the town consisted in its being a corporation of artisans exchanging the fruits of their industries for the surplus of farm produce which the peasants brought to their market-place. But the increasing trade of the towns, developed at first along the greater rivers, the arteries of the countries, gradually produced another source of wealth; and this commerce made great strides after the Crusades had opened the Eastern markets to European traders. Trade, commerce, and manufactures were the life of the towns, and were rapidly increasing their importance. In mediæval times each town was an independent economic centre, and the regulation of industry and of trade was an exclusively municipal affair. This state of matters had changed in some countries before the time of the Reformation, and statesmen had begun to recognise the importance of a national trade, and to take steps to further it; but in Germany, chiefly owing to its hopeless divisions, the old state of matters remained, and the municipalities continued to direct and control all commercial and industrial affairs. The towns had originally grown up under the protection of the Emperor, or of some great lord of the soil, or of an ecclesiastical prince or foundation, and the early officials were the representatives of these fostering powers. The descendants of this early official class became known as the “patricians” of the city, and they regarded all the official positions as the hereditary privileges of their class. The town population was thoroughly organised in associations of workmen, commonly called “gilds,” which at first concerned themselves simply with the regulation and improvement of the industry carried on, and with the education and recreations of the workers. But these “gilds” soon assumed a political character. The workmen belonging to them formed the fighting force needed for the independence and protection of the city. Each “gild” had its fighting organisation, its war banner, its armoury; and its members were trained to the use of arms, and practised it in their hours of recreation. The “gilds” therefore began to claim some share in the government of the town, and in most German cities, in the decades before the Reformation, the old aristocratic government of the “patricians” had given place to the more democratic rule of the “gilds.” The chief offices connected with the “gilds” insensibly tended to become hereditary in a few leading families, and this created a second “patriciat,” whose control was resented by the great mass of the workmen. Nürnberg was one of the few great German cities where the old “patricians” continued to rule down to the times of the Reformation.