Abraham Ibn-Daud was, however, not only a religious philosopher, but also a conscientious historian, and his historical labors have proved of greater service to Jewish literature than his philosophical studies. The newly-aroused conflict with the Karaites of Spain led him to inquire into their history. After the death of the emperor Alfonso, and the subsequent downfall of his favorite, Jehuda Ibn-Ezra, these people again raised their heads, and re-commenced issuing their polemical writings. Thereupon Ibn-Daud undertook to prove historically that rabbinical Judaism was based on an unbroken chain of traditions which began with Moses, and extended to Joseph Ibn-Migash. To this end he compiled the history of Biblical, post-exilic, Talmudical, Saburaic, Gaonic, and rabbinical times in a chronological order (1161). He entitled this work, which was written in Hebrew, "The Order of Tradition" (Seder ha-Kabbalah). The information which he imparts concerning the Spanish congregations is of the greatest value; he obtained his knowledge from the original labors of Samuel Ibn-Nagrela, and from independent historical researches. His account is brief, but accurate and authentic, and much may be read between the lines. His Hebrew style is flowing, and not altogether wanting in poetic coloring. A still more erudite, comprehensive, and profound mind was that of Abraham ben Meïr Ibn-Ezra of Toledo (born about 1088, died 1167). He was a man of remarkable ability, conquering with equal skill the greatest and the smallest things in science; he was energetic, ingenious, full of wit, but lacking in warmth of feeling. His extensive reading in all branches of divine and human knowledge was astonishing; he was also thoroughly acquainted with the literature of the Karaites. His, however, was not a symmetrically developed, strong personality, but was full of contradictions, and given to frivolity; at one time he fought against the Karaites, at another, he made great concessions to them. His polemical method was merciless, and he aimed less at discovering the truth than at dealing a sharp blow to an antagonist. His was a spirit of negation, and he forms the completest contrast to Jehuda Halevi, to whom he is said to have been closely related. Ibn-Ezra (as he is called) combined in his person irreconcilable contrasts. His clear vision, his sharp, analytical perception, his bold research, which was so far advanced as almost to bring him to Pantheism, existed side by side with a veneration for authority, which led him, with fanatical ardor, to accuse independent thinkers of heresy. His temperate mind, which examined into the origin of every phenomenon, did not prevent him from wandering in the twilight of mysticism. Though filled with trust in God, into whose hands he quietly resigned his lot, he believed in the influence of the stars, from which no man could possibly withdraw. Thus Ibn-Ezra was at once an inexorable