This traffic proved to be a source of great wealth for the citizens, who in time came almost to enjoy a monopoly of the inland trade in this part of the Balkan peninsula. But great as were the privileges which they enjoyed, merchants and miners were subject to depredations and arbitrary confiscations at the hands of the Servian kings, the Bosnian Bani, or the various minor feudatories. Most of the quarrels between Ragusa and the Slavonic States were caused by these depredations, which after all were natural enough. The Ragusan merchants succeeded in accumulating large fortunes by intelligent management and indefatigable industry, which the less hard-working Slaves, devoted to the arts of war, were incapable of acquiring. Whenever the King or vassal lord was in need of money, what could be simpler than to pounce down upon a richly-laden caravan on its way to or from the coast and plunder it or take heavy toll of it, or to impose fresh taxes on the wealthy colonies of “Uitlanders” at Rudnik, Srebrnica, or Brskovo? Ragusa was often forced to pay tribute to this or that sovereign to ensure safety from depredation, and in those days the line of division between feudalism and brigandage was very vague. But the mercantile communities were quite willing to undergo the risks for the sake of the large profits which they made. There can be no doubt that in this way a certain amount of civilisation was introduced into these lands which would otherwise have remained quite without the pale. The currents of western thought and culture found their way into Bosnia and Servia by way of Ragusa and the other Dalmatian towns rather than by Constantinople.[259] These civilising influences increased and spread until the curse of the Turkish conquest fell on the land like a blight, from which it is only now beginning slowly and painfully to recover. This mercantile development naturally led to the formation of numerous guilds or confraternities. Like other Ragusan institutions, they were based on Venetian models, and were really the beginnings of the modern mutual aid societies on a religious groundwork. Among the earliest of these are that of the joiners, founded in 1266; that of St. Michael, founded in 1290; that of the goldsmiths (1306), that of Rosgiato (1321), and that of St. Anthony the Abbot (1348). During the Venetian period they were under strict Government supervision, but after 1358 they were invested with political privileges and exemptions.[260] CHAPTER VI ART IN THE THIRTEENTH AND FOURTEENTH CENTURIES