Among the forbidden institutions upon which the Crusader found reason to reconsider his ideas, witchcraft took a prominent place. Anathema though it might be, it had a multitude of Oriental exponents, who, whatever they might have to look for in the next world, had little cause to complain of this. Such abominations cried for intelligent investigation, if only that they might be refuted, with the result that the Crusader returned home with the knowledge of many novel features that might be profitably added to the Western ritual of magic. Meanwhile in his absence his own native practitioners had not been idle. Faithful wives were anxious to know something of their lords' whereabouts, safety, or, it may be, fidelity. Those who were not faithful had even more need of tidings as to his probable return and of means for delaying it. In such emergencies the services of the witch were indispensable--and priestly prohibitions only served to advertise her powers and to increase the number of her suppliants. These various causes, and more particularly the last, combined to give witchcraft an importance in social life hitherto denied to it, and to draw down upon it more and more the wrath of Mother Church. She had, indeed, other no less pressing calls upon her attention. The long slumber of orthodoxy was at an end; many heresies disturbed the minds of the faithful. The revival of Latin literature stirred thoughts and feelings long blurred by Church teaching. The Crusaders were not the sole importers of Oriental ideas; Greek traders also, along with the drugs and perfumes of the East, brought new doctrines, received with dangerous tolerance. The vigorous Innocent III. quickly perceived the danger, and entered upon a systematic persecution of heretics. In 1208 a Papal Legate having been murdered by Raimond of Toulouse--against whom the Church had already serious cause of complaint, Innocent at once proclaimed a crusade, and the heretical Albigenses were involved in the ruin of their most powerful protector, suffering a persecution of almost unprecedented severity. The establishment of the Inquisition now became a logical necessity if the spread of heresy was to be saved, and little time was lost in its creation.