The echoes of Capistrano's venomous eloquence reached even Poland, disturbing the Jewish communities there from the tranquillity they had enjoyed for centuries. Poland had long been a refuge for hunted and persecuted Jews. Exiles from Germany, Austria and Hungary found a ready welcome on the Vistula. The privileges generously granted them by Duke Boleslav, and renewed and confirmed by King Casimir the Great, were still in force. The Jews were, in fact, even more indispensable in that country than in other parts of Christian Europe; for in Poland there were only two classes, nobles and serfs, and the Jews supplied the place of the middle class, providing merchandise and money, and bringing the dead capital of the country into circulation. During a visit which Casimir IV paid to Posen shortly after his accession, a fire broke out in this already important city, and, with the exception of its few brick houses, it was totally destroyed. In this conflagration, the original document of the privileges granted the Jews a century before by Casimir the Great perished. Jewish deputations from a number of Polish communities waited upon the king, lamenting the loss of these records, so important to them, and praying that new ones might be prepared according to existing copies, and that all their old rights might be renewed and confirmed. Casimir did not require much persuasion. In order that they might live in security and contentment under his happy reign, he granted them privileges such as they had never before enjoyed in any European state (14th August, 1447). This king was in no respect a slave of the church. So strictly did he keep the clergy within bounds that they charged him with persecuting and robbing them. He forbade their meddling in affairs of state, saying that in such matters he preferred to rely on his own powers.