In the Byzantine empire and in Italy, Christianity had from the very first shown more or less hostility to Judaism, but in the west of Europe, in France and Spain, where the Church established itself with difficulty, the situation of the Jews assumed a different and much more favorable aspect. The invasions of the barbarians had completely changed the social order existing in these countries. Roman institutions, both political and ecclesiastical, were nearly effaced, and the polity of the empires established by heathen or half Christianized nations was not built up on the basis of Church law. It was a long while before Catholicism gained a firm footing in the west of Europe, and the Jews who had settled there enjoyed undisturbed peace until the victorious Church gained the upper hand. The immigration of the Jews into these important and wealthy provinces took place probably as early as the time of the Republic or of Cæsar. The Jewish merchants whose business pursuits brought them from Alexandria or Asia Minor to Rome and Italy, the Jewish warriors whom the emperors Vespasian and Titus, the conquerors of Judæa, had dispersed as prisoners throughout the Roman provinces, found their way voluntarily or involuntarily into Gaul and Iberia. The presence of the Jews in the west of Europe is a certain fact only since the second century. The Gallic Jews, whose first settlement was in the district of Arles, enjoyed the full rights of Roman citizenship, whether they arrived in Gaul as merchants or as fugitives, with the peddler's pack or in the garb of slaves; they were treated as Romans also by the Frankish and Burgundian conquerors. The most ancient legislation of the Franks and Burgundians did not consider the Jews as a distinct race, subject to peculiar laws. In the Frankish kingdom founded by Clovis, the Jews dwelt in Auvergne (Arverna), in Carcassonne, Arles, Orleans, and as far north as Paris and Belgium. Numbers of them resided in the old Greek port of Marseilles, and in Béziers (Biterræ), and so many dwelt in the province of Narbonne that a mountain near the city of that name was called _Mons Judaicus_. The territory of Narbonne belonged for a long time to Visigothic Spain, and for this reason the Jewish history of this district reflects all the vicissitudes of the Jews on the further side of the Pyrenees. The Jews of the Frankish and Burgundian kingdoms carried on agriculture, trade, and commerce without restraint; they navigated the seas and rivers in their own ships. They also practised medicine, and the advice of the Jewish physicians was sought even by the clergy, who probably did not care to rely entirely on the miraculous healing powers of the saints and of relics. They were also skilled in the use of the weapons of war, and took an active part in the battles between Clovis and Theodoric's generals before Arles (508).