Sigismund III.'s successor, Vladislav IV., was not so zealous in his Catholicism and in his devotion to the Jesuits as his father. He exhibited a certain amount of tolerance towards the professors of other creeds, endeavored to uphold the ancient Jewish privileges, and made it, in general, his business to reconcile the warring estates with one another. However, the strife between the religious and social groups had already eaten so deeply into the vitals of Poland that even a far more energetic king than Vladislav IV. would scarcely have been able to put an end to it. Instead of harmonizing the conflicting interests, the King sided now with one, now with another, party. In 1633 Vladislav IV. confirmed, at the Coronation Diet,[63] the basic privileges of the Jews, granting them full freedom in their export trade, fixing the limits of their judicial autonomy, and instructing the municipalities to take measures for shielding them against popular outbreaks. But at the same time he forbade the Jewish communities to erect new synagogues or establish new cemeteries, without obtaining in each case a royal license. This restriction, by the way, may be considered a privilege, inasmuch as an attempt had been made by Sigismund III. to make the right of erecting synagogues dependent on the consent of the clergy. Though on the whole desirous of respecting the rights of the Jews, nevertheless, in individual cases, the King acted favorably on the petitions of various cities to restrict these rights, and occasionally revoked his own orders. Thus in June, 1642, he permitted the Jews of Cracow to engage freely in export trade, but two months later he withdrew his permission, the Christian merchants of Cracow having complained to him about the effectiveness of Jewish competition. Complying with the application of the burghers of Moghilev on the Dnieper,[64] he confirmed, in 1633, his father's orders concerning the transfer of the Jews from the center of the city to its outskirts, and subsequently, in 1646, sanctioned the decision of the magistracy prohibiting the letting of houses to them in a Christian neighborhood. The law forbidding Jews to engage in petty trade on the market-place effected in some cities a substantial rise in the prices of necessaries, and the Shlakhta petitioned the King to repeal this prohibition for the city of Vilna. Vladislav complied with the petition, but, to please the Vilna municipality, he imposed at the same time a number of severe restrictions on the local Jews, making them liable to the municipal courts in monetary litigation with Christians, confining their area of residence to the boundaries of the "Jewish street," and barring them from plying those trades which were pursued by the Christian trade-unions (1633). The same policy was responsible for the anti-Jewish riots which took place about the same time in Vilna, Brest, and other cities.