The compass--known in Italy as early as the twelfth century, but little used until the fourteenth--enabled the mercantile navy to discover new routes, and it was thus that true maritime commerce may be said regularly to have begun. The sailors of the Mediterranean, with the help of this little instrument, dared to pass the Straits of Gibraltar, and to venture on the ocean. From that moment commercial intercourse, which had previously only existed by land, and that with great difficulty, was permanently established between the northern and southern harbours of Europe. Flanders was the central port for merchant vessels, which arrived in great numbers from the Mediterranean, and Bruges became the principal depôt. The Teutonic league, the origin of which dates from the thirteenth century, and which formed the most powerful confederacy recorded in history, also sent innumerable vessels from its harbours of Lubeck (Fig. 197) and Hamburg. These carried the merchandise of the northern countries into Flanders, and this rich province, which excelled in every branch of industry, and especially in those relating to metals and weaving, became the great market of Europe (Fig. 198). The commercial movement, formerly limited to the shores of the Mediterranean, extended to all parts, and gradually became universal. The northern states shared in it, and England, which for a long time kept aloof from a stage on which it was destined to play the first part, began to give indications of its future commercial greatness. The number of transactions increased as the facility for carrying them on became greater. Consumption being extended, production progressively followed, and so commerce went on gaining strength as it widened its sphere. Everything, in fact, seemed to contribute to its expansion. The downfall of the feudal system and the establishment in each country of a central power, more or less strong and respected, enabled it to extend its operations by land with a degree of security hitherto unknown; and, at the same time, international legislation came in to protect maritime trade, which was still exposed to great dangers. The sea, which was open freely to the whole human race, gave robbers comparatively easy means of following their nefarious practices, and with less fear of punishment than they could obtain on the shore of civilised countries. For this reason piracy continued its depredations long after the enactment of severe laws for its suppression.