Whereas the Jews, disregarding the ancient regulations, have thrown off the marks by which they were distinguishable from the Christians, and have arrogated to themselves a form of dress which closely resembles that of the Christians, so that it is impossible to recognize them, be it resolved for permanent observance: that the Jews of our realm, all and sundry, in whatever place they happen to be found, shall wear special marks, to wit, a barret, or hat, or some other headgear of yellow cloth. Exception is to be made in favor of travelers, who, while on the road, shall be permitted to discard or conceal marks of this kind. The fine for violating this regulation is fixed at one gulden. The only articles of the "constitution" of 1538 which had serious consequences for the Jews of the Crown--the Jews of Lithuania were not affected by these regulations--were those barring them from tax-farming and subjecting them to commercial restrictions. The canonical law concerning a distinctive headgear was more in the nature of a demonstration than a serious legal enactment, since compliance with it, owing to the high state of culture among the Polish Jews and their important rôle in the economic life of the country, was a matter of impossibility. Behind this regulation lurks the hand of the Catholic clergy, which was alarmed at that time by the initial successes of the Reformation in Poland, and was in fear that the influence of Judaism might enhance the progress of the heresy. The excited imagination of the clerical fanatics perceived signs of a "Jewish propaganda" in the rationalistic doctrine of "Anti-Trinitarianism," which was then making its appearance, denying the dogma of the Holy Trinity. The specter of a rising sect of "Judaizers" haunted the guardians of the Church. One occurrence in particular engendered tremendous excitement among the inhabitants of Cracow. A Catholic woman of that city, Catherine Zaleshovska by name, the wife of an alderman, and four score years of age, was convicted of denying the fundamental dogmas of Christianity and adhering secretly to Jewish doctrines. The Bishop of Cracow, Peter Gamrat, having made futile endeavors to bring Catherine back into the fold of the Church, condemned her to death. The unfortunate woman was burned at the stake on the market-place of Cracow in 1539. The following description of this event was penned by an eye-witness, the Polish writer Lucas Gurnitzki: