This situation, however, did not continue long. Justinian's successors were obliged to abandon a great part of Italy forever to the powerful and uncouth Lombards (589), who, half heathen, half Arian, troubled themselves but little about the Jews. At all events there are no exceptional laws for the Jews to be met with in the Longobard code. Even when the Lombards embraced the Catholic faith, the position of the Jews in Italy remained bearable. The heads of the Catholic Church, the Popes, were free from extreme intolerance. Gregory I (590-604), called the Great and the Holy, who laid the foundation of the power of Catholicism, gave utterance to the principle that the Jews should be converted only by means of gentle persuasion and not by violence. He conscientiously maintained their rights of Roman citizenship, which had been recognized by various emperors. In the territory which was subject to the papal sway in Rome, Lower Italy, Sicily, and Sardinia, he steadfastly persisted in this course, in the face of the fanatical bishops, who regarded the oppression of the Jews as a pious work. His pastoral letters are full of earnest exhortations, such as the following: "We forbid you to molest the Jews or to lay upon them restrictions not imposed by the established laws; we further permit them to live as Romans and to dispose of their property as they will; we only prohibit them from owning Christian slaves." But greatly as Gregory abhorred the forcible conversion of the Jews, he exerted himself to win them for the Church by other means. He did not hesitate to make an appeal to cupidity, and remitted a portion of the land-tax to such of the Jewish farmers and peasants as embraced Christianity. He did not, indeed, deceive himself with the belief that the converts who were obtained in this manner were loyal Christians; he counted, however, upon their descendants. "If we do not gain them over," he wrote, "we at least gain their children." Having heard that a Jew named Nasas had erected an altar to Elijah (probably a synagogue known by this name) in the island of Sicily, and that Christians met there to celebrate divine service, Gregory commanded the prefect Libertinus to raze the building, and to inflict corporal punishment on Nasas for his offense. Gregory vigorously persecuted such of the Jews as purchased or possessed Christian slaves. In the Frankish empire, where fanaticism had not yet made its way, the Jews were not forbidden to carry on the slave trade. Gregory was indignant at this, and wrote to King Theodoric (Dieterich) of Burgundy, Theodebert, king of Austrasia, and also to Queen Brunhilde, expressing his astonishment that they allowed the Jews to possess Christian slaves. He exhorted them with great warmth to remove this evil, and to free the true believers from the power of their enemy. Reccared, the king of the Visigoths, who submitted to the papal see, was flattered beyond measure by Gregory for promulgating an edict of intolerance.