Seeing that even the study of the Talmud, so zealously pursued in Spain, had fallen into this state of stagnation and lassitude, the other branches of science could not complain that they made no progress, or were not attentively cultivated. The study of the Bible, Hebrew grammar, and exegesis were entirely neglected; we can recall hardly a single writer who earnestly occupied himself with these subjects. Owing to the energetic zeal of Abba-Mari, the interdict of Ben Adret, and the pronounced aversion of Asheri, reasoning had fallen into disrepute and decay. The truly orthodox shunned contact with philosophy as the direct route to heresy and infidelity, and pseudo-pious people behaved in a yet more prudish fashion towards it. It required courage to engage in a study inviting contempt and accusations of heresy. The Kabbala, too, had done its work, in dimming the eyes of men by its illusions. There were but few representatives of a philosophical conception of Judaism in those days; these were Isaac Pulgar, of Avila, David Ibn-Albilla of Portugal, and Joseph Kaspi of Argentière, in southern France.
Levi ben Gerson, or Leon de Bagnols, was more renowned and more talented than any of these. He was also called Leo the Hebrew, but more usually by his literary name Gersonides (born 1288, died about 1345). He belonged to a family of scholars, and among his ancestors he reckoned that Levi of Villefranche who had indirectly caused the prohibition of scientific study. In spite of the interdict of Ben Adret forbidding the instruction of youths in science, Gersonides was initiated into it at a very early age, and before he had reached his thirtieth year he was at work at a comprehensive and profound work upon philosophy. Gersonides was gifted with a versatile and profound intellect, and averse to all superficiality and incompleteness. In astronomy he corrected his predecessors, and made such accurate observations that specialists based their calculations upon them. He invented an instrument by means of which observations of the heavens could be made more certain. This discovery filled him with such ecstasy that he composed a Hebrew poem, a kind of riddle, upon it, though he was an unpoetical man, and had his head filled with dry calculations and logical conclusions. He also wrote works upon the science of medicine, and discovered new remedies. At the same time he was held in very high repute by his contemporaries as a profound Talmudist, and inspired by his love for systematic arrangement, wrote a methodology of the Mishna.
Maestro Leon de Bagnols, as he was called as a physician, fortunately did not belong to the Jews of France proper: he successively lived in Orange, Perpignan, and in Avignon, at this time the home of popedom. Therefore, he had not been a sufferer in the expulsion of his co-religionists from this land; but his heart bled at the sight of the sufferings which the exiles were made to undergo. He moreover escaped from the effects of the rising of the Shepherds, and the subsequent bitter calamities. At about the same time, his fertile powers of production began to put forth fruit, and he began the series of writings which continued for more than twenty years (1321–1343). None of his writings created such a sensation as his work on the philosophy of religion (Milchamoth Adonaï). In this he set forth the boldest metaphysical thoughts with philosophical calmness and independence, as if paying no heed to the fact that by his departure from the hitherto received notions upon these questions, he was laying himself open to the charges of heresy and heterodoxy. "If my observations are correct," he remarked, "then all blame leveled against me, I regard as praise." Leon de Bagnols belonged to a class of thinkers seldom met with, who, with majestic brow, seek truth for its own intrinsic value, without reference to other ends and results which might cause conflict. Levi ben Gerson thus expressed his opinion upon this subject: Truth must be brought out and placed beneath the glare of open daylight, even if it should contradict the Torah in the strongest possible manner. The Torah is no tyrannical law, which desires to force one to accept untruth as truth, on the contrary, it seeks to lead man to a true understanding of things. If the truth arrived at by investigation is in harmony with the utterances of the Bible, then so much the better. In his independence of thought, the only parallel to Gersonides among Jewish inquirers is Spinoza. Unlike many of his predecessors, he would not look upon science as a body of occult doctrines designed for an inner circle of the initiated. He moreover refused to follow slavishly the authorities in philosophy regarded as infallible. He propounded independent views in opposition not only to Maimuni and Averroes, but also to Aristotle. Leon de Bagnols did not establish a perfect and thoroughly organized system of the philosophy of religion, but treated of the difficulties which interested the thinkers of the age more incisively than any of his predecessors.
In spite of his great ability, Gersonides exercised very little influence upon Judaism. By the pious, he was denounced as a heretic, because of his independent research, and his ambiguous attitude towards the doctrine of the creation. They took the title of his chief work, "The Battles of the Lord," to mean "Battles against the Lord." So much the warmer was his reception by Christian inquirers after truth. Pope Clement VI, during the lifetime of the author, commanded his treatise upon astronomy and the newly-invented instrument to be translated into Latin (1342).
Of a similar nature was another representative of philosophical Judaism of this age, Moses ben Joshua Narboni, also called Maestro Vidal (born about 1300, died 1362). His father Joshua, who belonged to a family in Narbonne, but resided in Perpignan, was so warmly interested in Jewish, that is to say Maimunistic, philosophy, that in spite of the interdict hurled against all who studied the subject, he instructed his son therein when he was thirteen years old. Vidal Narboni became an enthusiastic student. He divided his admiration between Maimuni and Averroes, his writings consisting chiefly of commentaries upon their works. His travels from the foot of the Pyrenees to Toledo and back again to Soria (1345–1362) enriched and amended his knowledge. He was interested in anything worth knowing, and made observations with great accuracy. No calamities or troubles succeeded in damping his zeal in the inquiry after truth. In consequence of the Black Death, an infuriated mob fell upon the community at Cervera. Vidal Narboni was compelled to take to flight with the rest of the congregation; he lost his possessions, and, what was more painful to him, his precious books. These misfortunes did not disturb him; he took up the thread of his work where it had been interrupted. He accomplished no entirely independent or original work; he was a true Aristotelian of Averroist complexion. Narboni conceived Judaism as a guide to the highest degree of theoretical and moral truth: the Torah has a double meaning—the one simple, direct, for the thoughtless mob, and the other of a deeper, metaphysical nature for the class of thinkers—a common opinion in those times, Gersonides alone demurring. Narboni, too, gave expression to heretical views, that is, such as are contrary to the ordinarily accepted understanding of Judaism, but not with the freedom and openness of Levi ben Gerson. He rejected the belief in miracles, and attempted to explain them away altogether, but defended man's freedom of will by philosophical arguments. Death overtook him in the very midst of his labors when, advanced in years, he was on the point of returning to his native land from Soria, on the other side of the Pyrenees, where he had spent several years.
Though the Karaite, Aaron ben Elia Nicomedi, may be reckoned among the philosophers of this time, he can scarcely be admitted into the company of Levi ben Gerson and the other Provençal thinkers. His small stock of philosophical knowledge was a matter of erudition, not the result of independent thought. Aaron II, of Nicomedia (in Asia Minor, born about 1300, died 1369), who probably lived in Cairo, was indeed superior to his ignorant brother Karaites, but several centuries behind the Rabbanite philosophers. His thoughts sound like a voice from the grave, or as of one who has slumbered for many years, and speaks the language of antiquity, not understood by the men of his own day.
Aaron ben Elia was not even able to indicate the end aimed at by his work, "The Tree of Life." Without being himself fully conscious of his motives, he was guided in its composition by jealous rivalry of Maimuni and the Rabbanites. It vexed him sorely that Maimuni's religious philosophical work, "The Guide," was perused and admired not only by Jews, but also by Christians and Mahometans, whilst the Karaites had nothing like it. Aaron desired to save the honor of the Karaites by his "Tree of Life." He sought to detract from the merits of the work of Maimuni, and remarked that some of the statements to be found in the book had been made by Karaite philosophers of religion. Notwithstanding this, he followed Maimuni most minutely, and treated only of those questions which the latter had raised; but he sought to solve them not by the aid of philosophy, but by the authority of the Bible.
The history of this period, when dealing with events in Germany, has nothing but calamities to record: bloody assaults, massacres, and the consequent intellectual poverty. Asheri and his sons were either deluded or unjust when they preferred bigoted Germany to Spain, at that time still tolerable, and cast longing looks thitherwards from Toledo. From the time of Asheri's departure till the middle of the century, misfortune followed upon misfortune, till nearly all the congregations were exterminated. On account of this state of affairs, even the study of the Talmud, the only branch of learning pursued in Germany with ardor and thoroughness, fell into decay. How could the Germans gather intellectual strength, when they were not certain about one moment of their lives, or their means of sustenance? Their state in a most literal way realized the prophetical threat of punishment: "Thy life shall hang in doubt before thee; and thou shalt fear day and night. In the morning thou shalt say, Would God it were even! and at even thou shalt say, Would God it were morning! for the fear of thine heart wherewith thou shalt fear." Emperor Louis, the Bavarian, is reported to have been favorably inclined towards the Jews, which is said to have made them proud. But this is idle calumny both against the emperor and the Jews. No German ruler before him had treated his "servi cameræ" so badly, pawned them and sold them, as Louis the Bavarian. He also imposed a new tax upon the Jews, the so-called golden gift-pence. As the emperors had gradually pawned all the revenues derived from their "servi cameræ" to enable them to satisfy their immediate necessity for money, Louis the Bavarian was driven to cogitate upon some new means of obtaining supplies from them. He promulgated a decree (about 1342), which commanded that every Jew and Jewess in the German Empire above the age of twelve, and possessed of at least more than twenty florins, should pay annually to the king or the emperor a poll-tax of a florin. He probably derived his right, if, indeed, the question of right was considered in reference to the treatment of Jews, from the fact that the German emperors were in possession of all the prerogatives once claimed by those of Rome. As the Jews, since the days of Vespasian and Titus, had been compelled to pay a yearly tax to the Roman emperors, the German rulers declared themselves the direct heirs to this golden gift-pence.
Hitherto the massacres of Jews in Germany had taken place only at intervals, and in a few places; but now, under the reign of Louis, owing to riots and civil wars, they became much more frequent. During two consecutive years (1336–1337), a regularly organized band of peasants and rabble, who called themselves "the beaters of the Jews," made fierce attacks upon them with unbridled fury and heartless cruelty. Two dissolute noblemen were at the head of this troop; they gave themselves the name of Kings Leather-arm (Armleder) from a piece of leather which they wore wound round the arm. In this persecution, as in that of Rindfleisch, the fanaticism and blind superstition inculcated by the church played an important part. One of the Leather-arms announced that he had received a divine revelation which directed him to visit upon the Jews the martyrdom and the wounds which Jesus had suffered, and to avenge his crucifixion by their blood. Such a summons to arms seldom remained unanswered in Germany. Five thousand peasants, armed with pitchforks, axes, flails, pikes, and whatever other weapons they could lay hands upon, gathered around the Leather-arms, and inflicted a bloody slaughter upon the Jewish inhabitants of Alsace and the Rhineland as far as Suabia. As frequently happened during such barbarous persecutions, numbers of Jews, on this occasion also, put an end to their own lives, after having slain their children to prevent their falling into the hands of the Church. Emperor Louis the Bavarian did indeed issue commands to protect the heretic Jews (April, 1337), but his help came too late, or was of little effect. At length the emperor succeeded in capturing one of the Leather-arms, whom he ordered to be executed.
At about the same time a bloody persecution, prompted by the frenzy of avarice, was set on foot in Bavaria. The councilors of the city of Deckendorf (or Deggendorf) desired to free themselves and all the citizens from their debts to the Jews, and enrich themselves besides. To carry out this plan, the fable of the desecration of the host by the Jews, with the accompaniment of the usual miracles, was spread abroad. When the populace had been incited to a state of fanatical frenzy, the council proceeded to execute the project which it had secretly matured outside the town, so as not to arouse any suspicion among the Jews. On the appointed day (30th September, 1337), at a signal from the church bell, the knight Hartmann von Deggenburg, who had been initiated in the conspiracy, rode with his band of horsemen through the open gates into Deckendorf, and was received with loud rejoicing. The knight and the citizens thereupon fell upon the defenseless Jews, put them to death by sword and fire, and possessed themselves of their property. In honor of the miracles performed by the host that had been pierced by the knives of the Jews, a church of the Holy Sepulcher was erected, and appointed as a shrine for pilgrims; and the puncheons which the Jews had used, together with the insulted host, were placed beneath a glass case, and guarded as relics. For many centuries they were displayed for the edification of the faithful,—perhaps are still displayed. The lust for slaughter spread abroad into Bavaria, Bohemia, Moravia, and Austria. Thousands of Jews perished by different forms of torture and death. Only the citizens of Vienna and Ratisbon protected their Jewish inhabitants against the infuriated mob. The friendly efforts of Pope Benedictus XII were of little avail against the brutal spirit of the then Christian world.