The unpitying harshness of canonical legislation against the children of Israel was unconsciously based on fear. All-powerful Christianity dreaded the influence which the Jewish mind might exert on the Christian population in too familiar intercourse. What the papacy concealed in the incense-clouds of its official decrees was disclosed by a philosophical writer and cardinal standing in close relation with the papal court. Nicholas de Cusa (from Cues on the Moselle), the last devotee of scholasticism, into which he tried to introduce mystic elements, enthusiastically advocated, in the face of the dissensions of Christendom, a union of all religions in one creed. The church ceremonies he was prepared to sacrifice, nay, he was ready to accept circumcision, if, by such means, non-Christians could be won over to the belief in the Trinity. He feared, as he distinctly said, the stiffneckedness of the Jews, who cling so stubbornly to their monotheism; but he consoled himself with the reflection that an unarmed handful could not disturb the peace of the world. It is true, the Jews were unarmed; but, mentally, they were still powerful, and Nicholas resolved to devote himself to the task of depriving them of intellectual strength. The pope had appointed him legate for Germany, where he was to reform church and cloister (1450–1451). But the cardinal also occupied himself with the Jewish question. At the provincial council of Bamberg he put into force the canonical statute concerning Jew badges, which provided that men should wear round pieces of red cloth on their breasts, and women blue stripes on their head-dresses—as if the branding of Jews could heal the dissolute clergy and their demoralized flocks of their uncleanness. The only result of the isolation of the Jews was their protection from the taint of prevailing immorality. The cardinal was not successful in purifying the clergy, or in putting an end to the fraud of bleeding hosts and miracle-working images, against which he had exclaimed so loudly. The church remained corrupt to the core. There would have been abundant cause to fear the Jews, if they had been permitted to probe the suppurating wounds.

Especially troublesome to the church were the thousands of baptized Jews in Spain, who had been driven into its fold by the massacres, pulpit denunciations, and legal restrictions to which their race was exposed. Not only the lay new-Christians, but also those who had taken orders or had assumed the monk's garb, continued to observe, more or less openly, the Jewish religious laws. The sophistry of the converts, Paul de Santa Maria and Geronimo de Santa Fé, regarding the testimony in the Old Testament and the Talmudic Agada to the Messiahship of Jesus, the Incarnation of God, the Trinity and other church dogmas, impressed the Marranos but little. In spite of baptism, they remained stiff-necked and blind, i. e., true to the faith of their fathers. Don Juan of Castile, at the instigation of his favorite, Alvaro de Luna, who was anxious to strike at his arch-enemies, the new-Christians, complained to Pope Nicholas V of the relapses of the Marranos, and the pontiff knew of no remedy but force. He addressed rescripts to the bishop of Osma and the vicar of Salamanca (November 20th, 1451), empowering them to appoint inquisitors to inquire judicially into cases of new-Christians suspected of Judaizing. The inquisitors were authorized to punish the convicted, imprison them, confiscate their goods and disgrace them, to degrade even priests, and hand them over to the secular arm—a church euphemism for condemning them to the heretic's stake. This was the first spark of the hell-fire of the Inquisition, which perpetrated more inhumanity than all the tyrants and malefactors branded by history. At first this bull seems to have been ineffectual. The times were not ripe for the bloody institution. Besides, the Christians themselves helped to keep up the connection of the baptized Jews with their brethren in race. They denied equal rights to new-Christians of Jewish or Mahometan origin, and wished to exclude them from all posts of honor. Against this antipathy, inherent in the diversity of national elements, the pope was compelled to issue a bull (November 29th, 1451), but it was powerless to uproot the prejudice. It could be removed only by higher culture, not at the dictation of a church chief, even though he boasted of infallibility.

How absurd, then, to continue driving such proselytes into the church! Yet this was done by the Franciscan monk, John of Capistrano (of Neapolitan origin), who is responsible for immense injury to the Jews of many lands. This mendicant friar, of gaunt figure and ill-favored appearance, possessed a winning voice and an iron will, which enabled him to obtain unbounded influence, not only over the stupid populace, but also over the cultivated classes. With a word he could fascinate, inspire, or terrify, persuade to piety or incite to cruelty. Like the Spanish Dominican, Vincent Ferrer, the secret of Capistrano's power lay not so much in his captivating eloquence as in the sympathetic modulations of his voice and the unshakable enthusiasm with which he clung to his mistaken convictions. He himself firmly believed that, with the blood he had gathered from the nose of his master, Bernard of Siena, and his capuche, he could cure the sick, awake the dead and perform all kinds of miracles, and the misguided people not only believed but exaggerated his professions. His strictly ascetic life, his hatred of good living, luxury and debauchery, made an impression the deeper from its striking contrast to the sensuality and dissoluteness of the great bulk of the clergy and monks. Wherever Capistrano appeared, the people thronged by thousands to hear him, to be edified and agitated, even though they did not understand a syllable of his Latin addresses. The astute popes, Eugenius IV and Nicholas V, recognized in him a serviceable instrument for the restoration of the tottering authority of St. Peter. They rejoiced in his homilies on the infallibility of the papacy and his fiery harangues on the extermination of heretics, and the necessity of withstanding the victoriously advancing Turks. They offered no objection if, at the same time, he thought proper to vent his monkish gall upon harmless amusements, pastimes and the elegancies of life, seeing that they themselves were not disturbed in their enjoyments and pleasures. Among the standing themes of Capistrano's exciting discourses—second only to his rancor against heretics and Turks, and his tirades against luxury and sports—were his denunciations of the impieties and the usury of Jews. This procured his appointment by Pope Nicholas to the post of inquisitor of the Jews, his duty being to superintend the enforcement of the canonical restrictions against them. He had in Naples occupied the position of inquisitorial judge for the Jews, on the nomination of Queen Joanna, who had empowered him to punish with the severest penalties any failure to observe the ecclesiastical law or wear the Jew badge.

When this infuriate Capuchin visited Germany, he spread terror and dismay among the Jews. They trembled at the mention of his name. In Bavaria, Silesia, Moravia, and Austria, the bigotry of the Catholics, already at a high pitch on account of the Hussite schism, was further stirred by Capistrano, and, the Bohemian heretics being beyond its reach, it vented itself upon Jews. The Bavarian dukes, Louis and Albert, who had on one occasion before driven the Jews out of their territories, were made still more fanatical by Capistrano. The former demanded of certain counts, and of the city of Ratisbon, that they expel the Jews. The burgomaster and town council, however, refused, and would not withdraw the protection and the rights of citizenship which the Jews had enjoyed from an early period. But they could not shield them from the hostility of the clergy. Eventually even the Ratisbon burghers, despite their good will for their Jewish fellow-citizens, fell under the influence of Capistrano's fanaticism, and allowed themselves to be incited to acts of unfriendliness. In the midwife regulations, promulgated during the same year, occurs a clause prohibiting Christian midwives from attending Jewish women, even in cases where the lives of the patients were at stake.

The change of public feeling in respect to the Jews, brought about by Capistrano, is strikingly illustrated by the conduct of one eminent ecclesiastic before and after the appearance of the Capuchin in Germany. Bishop Godfrey, of Würzburg, reigning duke of Franconia, shortly after his accession to the government of the duchy, had granted the fullest privileges to the Jews. More favorable treatment they could not have desired. For himself and his successors he promised special protection to all within his dominions, both to those settled and those who might settle there later. They were to be freed from the authority of the ordinary tribunals, lay and ecclesiastical, and to have their disputes inquired into and adjudicated by their own courts. Their rabbi (Hochmeister) was to be exempt from taxes, and to be allowed to receive pupils in his Yeshiba at his discretion. Their movements were to be unrestricted, and those who might desire to change their place of residence were to be assisted to collect their debts, and provided with safe-conduct on their journeys. It was further promised that these privileges should never be modified or revoked, and the dean and chapter unanimously recognized and guaranteed them "for themselves and their successors in the chapter." Every Jew who took up his abode within Bishop Godfrey's jurisdiction was provided with special letters of protection. But after Capistrano had begun his agitation, how different the attitude towards Jews! We soon find the same bishop and duke of Franconia issuing, "on account of the grievous complaints against the Jews in his diocese," a statute and ordinance (1453) decreeing their banishment. They were allowed until the 18th January of the following year to sell their immovables, and within fourteen days after that date, they were to leave, for "he (the bishop) would no longer tolerate Jews in his diocese." The towns, barons, lords, and justices were enjoined to expel the Jews from their several jurisdictions, and Jewish creditors were deprived of a portion of the debts owing to them. When Jews were concerned, inhuman fanaticism could beguile a noble-hearted prince of the church and an entire chapter of ecclesiastics into a flagrant breach of faith.

Capistrano's influence was most mischievous for the Jews of Silesia. Here he showed himself in truth to be the "Scourge of the Jews," as his admirers called him. The two chief communities in this province, which belonged half to Poland and half to Bohemia, were at Breslau and Schweidnitz, and the Jews composing them, not being permitted to possess real property, and being, besides, largely engaged in the money traffic, had considerable amounts of money at their command. The majority of the nobles were among their debtors, and several towns were either themselves debtors or had become security for their princes. Hence it is not unlikely that some debtors of rank secretly planned to evade their liabilities by ridding themselves of the Jews. At any rate the advent of the fanatical Franciscan afforded an opportunity for carrying out such a design.

Capistrano came to the Silesian capital on the invitation of the bishop of Breslau, Peter Novak, who found himself unable to control his subordinate ecclesiastics. Summoning the clergy to his presence, the Franciscan preacher upbraided them for their sinful, immoral, and sensual lives. The doors of the church in which the interview took place were securely bolted, so that no lay ear might learn the full extent of the depravity of the ministers of the Gospel. But nearer to his heart than the reclamation of the clergy was the extermination of the Hussites, of whom there were many in Silesia, and the persecution of the Jews. The frenzied fanaticism with which Capistrano's harangues inspired the people of Breslau directed itself principally against the Jews. A report was spread that a Jew named Meyer, one of the wealthiest of the Breslau Israelites, in whose safe-keeping were many of the bonds of the burghers and nobles, had purchased a host from a peasant, had stabbed and blasphemed it, and then distributed its fragments among the communities of Schweidnitz, Liegnitz, and others for further desecration. It need hardly be said that the wounded host was alleged to have shed blood. This imbecile fiction soon reached the ears of the municipal authorities, with whom it found ready credence. Forthwith all the Jews of Breslau, men, women and children, were thrown into prison, their entire property in the "Judengasse" seized, and, what was most important to the authors of the catastrophe, the bonds of their debtors, worth about 25,000 Hungarian gold florins, confiscated (2d May, 1453). The guilt of the Jews was rendered more credible by the flight of a few of them, who were, however, soon taken. Capistrano assumed the direction of the inquiry into this important affair. As inquisitor, the leading voice in the prosecution of blasphemers of the consecrated wafer by right belonged to him. He ordered a few Jews to be stretched on the rack, and personally instructed the torturers in their task—he had experience in such work. The tortured Israelites confessed. Meantime another infamous lie was circulated. A wicked baptized Jewess declared that the Breslau Jews had once before burnt a host, and that, on another occasion, they had kidnaped a Christian boy, fattened him, and put him into a cask studded with sharp nails, which they rolled about until their victim gave up the ghost. His blood had been distributed among the Silesian communities. Even the bones of the murdered child were alleged to have been found. The guilt of the Jews appeared established in these various cases, and a large number, in all 318 persons, were arrested in different localities, and brought to Breslau. Capistrano sat in judgment upon them, and hurried them to execution. At the Salzring—now Blücherplatz—where Capistrano resided, forty-one convicted Jews were burnt on one day (2d June, 1453). The rabbi (Phineas?) hanged himself; he had also counseled others to take their own lives. The remainder were banished from Breslau, all their children under seven years of age having previously been taken from them by force, baptized, and given to Christians to be brought up. This was Capistrano's wish, and in a learned treatise he explained to King Ladislaus that it was in consonance with the Christian religion and orthodoxy. The honest town clerk, Eschenloer, who did not venture to protest aloud against these barbarities, wrote in his diary, "Whether this is godly or not, I leave to the judgment of the ministers of religion." The ministers of religion had transformed themselves into savages. The goods of the burnt and banished Jews were, of course, seized, and with their proceeds the Bernardine church was built. It was not the only church erected with bloody money. In the remaining Silesian towns the Jews fared no better. Some were burnt, and the rest chased away, stripped almost to the skin.

When the young king, Ladislaus, was petitioned by the Breslau town council to decree that from that time forward no Jew would be allowed to settle in Breslau, not only did he assent "for the glory of God and the honor of the Christian faith," but he added, in approval of the outrages committed, "that they (the Silesian Jews) had suffered according to their deserts," a remark worthy of the son of Albert II, who had burnt the Austrian Jews. The same monarch also sanctioned—doubtless at the instigation of Capistrano, who passed several months at Olmütz—the expulsion of the Jews from the latter place and from Brünn.

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.

Either the king was misled by a false copy of the original charters, or he desired to avail himself of the opportunity of enlarging their scope without appearing to make fresh concessions; at all events, the privileges accorded under the new statute were, in many respects, more considerable than those formerly enjoyed by the Jews. Not alone did it permit unrestricted trading and residence all over the then very extensive kingdom of Poland, but it annulled canonical laws often laid down by the popes, and only recently re-enacted by the general church council of Basle. Casimir's charter mentioned that Jews and Christians might bathe together, and in all respects enjoy free intercourse with each other. It emphatically decreed that no Christian could summon a Jew before an ecclesiastical tribunal, and that if a Jew was so summoned, he need not appear. The palatines in their several provinces were enjoined to see that the Jews were not molested by the clergy, and generally to extend to them powerful protection. Furthermore, no Jew might be accused of using Christian blood in the Passover ceremonies, or of desecrating hosts, "Jews being innocent of such offenses, which are repudiated by their religion." If a Christian charged an individual Jew with using Christian blood, his accusation had to be supported by native, trustworthy Jewish witnesses and four similarly qualified Christian witnesses, and then the accused was to suffer for his crime, and his co-religionists were not to be dragged into it. In the event, however, of the Christian accuser not being in a position to substantiate his charge by credible testimony, he was to be punished with death. This was a check on ever-recurring calumny with its train of massacres of Jews. Casimir also recognized the judicial autonomy of the Jewish community. In criminal cases between Jews, or between Jews and Christians, the ordinary tribunals were not to interfere, but the palatine, or his representative, assisted by Jews, was to adjudicate. In minor law-suits the decision was to rest with the Jewish elders (rabbis), who were permitted to inflict a fine of six marks in cases where their summonses were not obeyed. To keep the authority of the Jewish courts within reasonable bounds, Casimir's charter enacted that the ban should be pronounced on a Jew only with the concurrence of the entire community. Truly, in no part of Christian Europe were the Jews possessed of such important privileges. They were renewed and issued by the king with the assent of the Polish magnates. Also the Karaite communities of Troki, Luzk, etc., received from Casimir a renewal and confirmation of the privileges granted them by the Lithuanian Duke Witold in the thirteenth century.