On the whole, the fanaticism of the second crusade claimed fewer Jewish victims than the first. This was partly owing to the protection afforded to the Jews by the spiritual and temporal dignitaries, and also because the participation of the German Emperor and the King of France did not permit such crowds of crusading marauders as had accompanied the expedition of William the Carpenter and Emicho of Leiningen. But the Jews were compelled to pay a high price for the shelter which was granted them, the price being their whole future. The German Emperor from this time forward was regarded by the Jews as their protector, and he considered himself as such, demanding in return the fulfilment of certain duties. The German Jews, who had hitherto been as free as the Germans or Romans, henceforth became the "servants of the chamber" (servi cameræ) of the Holy Roman empire. This hateful name at first only signified that the Jews enjoyed immunity from all attacks like the imperial servants, and had to pay a certain tax to the emperor for the protection thus granted to them, and that they had to perform extraordinary services. But in later times the word was employed in its original, odious sense, and the Jews were looked upon as bondmen and dependent slaves. The German Jews who were on the point of raising themselves from a state of barbarism, were thus hurled into the depths of an abyss of degradation, from which they were enabled to raise themselves only after a lapse of six hundred years. For this reason, their intellectual efforts bore the stamp of degeneracy, their poems consisted only of elegies and lamentations, which, like their speech, were tasteless and barbaric, and even in the study of the Talmud very little work of note was accomplished. The German Jews were pariahs in history till the end of the eighteenth century. In France, on the other hand, where other political and social conditions prevailed, Jewish culture was vigorous enough to put forth blossoms.
Whilst the Jews of France and Germany still stood in dread of the crusaders, a persecution broke out in the north of Africa, which was of longer duration, and produced different results. It was stirred up by a man who combined the characters of philosopher, reformer and conqueror, and manifested a peculiar political and religious enthusiasm. Abdallah Ibn-Tumart, who came from the northwest of Africa, while living in Bagdad, was inspired by the moral enthusiasm of the mystic philosopher Alghazali. On his return home to Africa, he preached to the simple Moorish tribes simplicity of living and dress, hatred of poetry, music and painting, and war against the Almoravide kings, who were devoted to a life of refinement. On the other hand, Ibn-Tumart rejected the Sunnite teachings of Mahometan orthodoxy, and the literal interpretation of the verses of the Koran, which affirmed that God had the feelings of man, and was affected by the same emotions as man. He obtained a large following among the Moors, and founded a sect, whose members, from the fact that they maintained the true unity of God without any corporeal representations (Tauchid), were termed Almovachides or Almohades (Unitarians). This sect acknowledged Ibn-Tumart as the Mahdi, the heaven-sent Imam of Islam. With the tocsin of rebellion and the sword of war against the reigning Almoravides, Ibn-Tumart spread his religious and moral reformation in the northwest of Africa. After his death, his disciple Abdulmumen succeeded to the leadership of the Almohades, and was recognized as the Prince of the Faithful (Emir al-Mumenin). He achieved victory after victory, and in his onward progress he destroyed the dynasty of the Almoravides, and became monarch of the whole of northern Africa. Abdulmumen, however, was a fanatic, and as he had extirpated the Almoravides with fire and sword, not only for political reasons, but also because they professed another belief, he would not suffer any other religion in his kingdom.
When the capital, Morocco, after a long and obstinate siege, fell into the hands of Abdulmumen, the new ruler summoned the numerous Jews of the town, and addressed them in the following terms: "You do not believe in the mission of the prophet Mahomet, and you think that the Messiah, who has been announced to you, will confirm your law, and strengthen your religion. Your forefathers, however, asserted that the Messiah would appear at the latest about half a century after the coming of Mahomet. Behold! that half a century has long passed, and no prophet has arisen in your midst. The patience with which you have been treated has come to an end. We can no longer permit you to continue in your state of unbelief. We no longer desire any tribute from you. You have only the choice between Islam and death." The despair of the Jews at this stern proclamation was very great. It was the second time, since they had come under Mahometan rule, that the mournful alternative was offered to them, either to surrender their life or their faith. Moved by the representations that were made to him, Abdulmumen modified the edict by allowing the Jews to emigrate. He also allowed them a certain time to dispose of such property as they could not take with them. Those who preferred to remain in the African kingdom were obliged to accept Islam under penalty of death. Those, however, to whom Judaism was precious left Africa, and emigrated to Spain, Italy and other places. The majority of them, however, ostensibly yielded, and took the disguise of Islam whilst hoping for more favorable times (1146).
The persecution was directed not only against the Jews of Morocco, but against all who lived in northern Africa, and as often as the Almohades captured a city, the same edict was promulgated. The Christians also suffered through this persecution, but as Christian Spain stood open to receive them, and they might expect to be received with open arms by their co-religionists, they were more steadfast, and departed from the country in large bodies. Synagogues and churches alike were destroyed throughout the land of the Almohades, which extended by degrees from the Atlas mountains to the boundary of Egypt, and no traces remained of the former Jewish and Christian residents.
Although many north-African Jews had accepted Islam, there were but few who became real converts. Nothing was demanded of them except to profess belief in the prophetic mission of Mahomet, and occasionally to attend the mosque. In private, however, they scrupulously practised the Jewish rites, for the Almohades employed no police spies to observe the actions of the converts. Not only the common people, but also pious rabbis maintained this outward semblance of belief, soothing their conscience with the reflection that idolatry and denial of Judaism were not demanded of them, as they were simply required to utter the formula that Mahomet was a prophet, which in no way suggested idolatry. Some consoled themselves with the hope that this state would not long continue, and that the Messiah would soon appear, and deliver them from their misery.
Under the disguise of Moslems, the Maghreb Jewish scholars even pursued the study of the Talmud with their usual zeal, and assembled at their colleges the studious youth, who at the same time were compelled to engage in the study of the Koran. But truly conscientious and pious men were unable to play this double part for any length of time. They threw off the hateful mask, and openly professing Judaism, suffered martyrdom, as happened in Fez, Segelmessa, Draï and other towns.
The victorious Abdulmumen was not content with the possession of all Barbary; he cast longing eyes upon the fair land of Andalusia, thinking it an easy task to wrest it from the power of the Almoravide and Christian rulers, and annex it to his realm. The conquest of the Mahometan territory in southern Spain proved easy on account of internal dissensions. Cordova, the capital of Andalusia, fell into the power of the fanatical Almohades in June, 1148, and before the end of a year the greater part of Andalusia was in their hands. The beautiful synagogues which the piety, the love of splendor, and the refined taste of the Andalusian Jews had built, fell a prey to the destructive frenzy of fanaticism. The aged rabbi of Cordova, the philosopher Joseph Ibn-Zadik, witnessed this sad downfall of the oldest and most distinguished congregation, but died soon after (at the end of 1148 or the commencement of 1149). The renowned Jewish academies at Seville and Lucena were closed. Meïr, the son and successor of Joseph Ibn-Migash, went from Lucena to Toledo, and with him all those able to escape. The remainder followed the example of the African Jews, yielding for the moment to coercion and pretending to acknowledge Islam, though in private they observed their ancient faith, till they found an opportunity of openly professing Judaism. Women and children, together with the property of the exiles, fell into the hands of the conquerors, who treated feeble captives as slaves.
In this dark epoch, when the center of Judaism was destroyed, a favorable change of fortune created a new center. Christian Spain, which had developed great power under the emperor Alfonso Raimundez (1126–1157), became a refuge for the persecuted Andalusian Jews, and Toledo, which had been made the capital of the realm, became a new focus, whence the rays of Jewish science emanated. This favorable change was due to the work of a man who deserves to be ranked with Ibn-Shaprut and Ibn-Nagrela. The wise and philanthropic Emperor Alfonso Raimundez had a Jewish favorite in the person of the still youthful Jehuda Ibn-Ezra, the son of that Joseph Ibn-Ezra, who, together with his three brothers, is celebrated in Judæo-Spanish literature. On taking possession of the border fortress of Calatrava, between Toledo and Cordova (1146), the emperor, probably as a reward for his bravery, appointed Ibn-Ezra commander of the place, and invested him with the dignity of a prince (Nasi).
Jehuda Ibn-Ezra was the guardian-angel of his unfortunate co-religionists, who were fleeing before the fury of the victorious Almohades. He assisted them to find homes and employment in Christian Spain, and used his riches in ransoming captives, in clothing the naked and feeding the hungry. The congregation of Toledo was very much increased by the immigrant Jews. Meïr Ibn-Migash opened an academy for the study of the Talmud, and numerous pupils attended it. Jewish learning under the protection of the Christian king, now flourished in Toledo after its expulsion from the Mahometan kingdom.
Jehuda Ibn-Ezra rose still higher in the favor of the Spanish emperor, and was appointed steward of the imperial palace (about 1149). This Jewish prince, in his zeal for Rabbanism, hurried into a persecution which forms a blot on his fair fame. The Karaites who had settled in Christian Spain, and who towards the end of the eleventh century had suffered persecution at the hands of a Rabbanite, Joseph Al-Kabri, had since that time again become a numerous body, and strove to regain their ancient splendor. They brought the large literature of their Eastern and Egyptian leaders into Castile, and were thereby strengthened in their deep antipathy to Rabbinical Judaism. At this time a Karaite of Constantinople, Jehuda ben Elia Hadassi, who styled himself "a mourner for Zion" (ha-Abel), renewed the battle against the Rabbanites, and wrote a comprehensive book under the name of "Eshkol ha-Kofer," in which he discussed with great warmth the oft-disputed differences between the two Jewish schools (1149), and rekindled the flame of hostility. Jehuda Hadassi wrote with intense passion, but employed harsh language, alphabetical acrostics, and a wretched, monotonous rhyme. This hostile work was probably introduced into Castile, and re-opened the conflict. Instead of having this polemical book confuted by some able Rabbanite, Jehuda Ibn-Ezra called in the aid of the secular arm, and besought the permission of the emperor Alfonso to persecute the Karaites. He did not consider that the dormant fire of persecution, if once rekindled, would sooner or later blaze around the head of the persecutors. With the emperor's permission, Jehuda Ibn-Ezra humbled the Karaites so sorely that they were never again able to raise their heads. Their fate is not known, but they were probably banished from the towns wherein Rabbanites dwelt (1150–1157). The favorable condition of the Jews in Castile did not last long. After the death of the emperor and of his eldest son, the King of Castile (1158), Jehuda Ibn-Ezra lived to see troublous times. During the minority of the Infante Alfonso a bitter civil war broke out between the noble houses of De Castro and De Lara, in which the other Christian kings took part; the fair land was devastated, and the capital, Toledo, became the scene of bloody fights. The Christian monarchs were not powerful enough to defend their borders against the continual irruptions of the Almohades, and were obliged to leave this task to the fanatical orders of knights, which were now again called into active service. The Spanish Jews, unlike their German and French brethren, did not remain mere indifferent spectators during these political struggles and wars, but took the liveliest interest in all that was going on, joining one or the other of the opposing sides.