The chief aim of the Roman Pontiffs, indeed, now was to crush in its infancy every doctrine which had the smallest tendency to oppose their exorbitant power. In the year 1163, the Synod of Tours commanded all the bishops and priests in the country of Toulouse, "to take care, and to forbid under pain of excommunication, every person from presuming to give reception, or the least assistance, to the followers of heresy, wherever they should be discovered." This decree had in view, more particularly, the Waldenses and Albigenses, an eminent Christian community who inhabited the valleys of Piedmont and the south of France, and who held doctrines different from those which were commanded by the Popes, on pain of death, to be implicitly believed. The Waldenses, whose religious sentiments were similar to those of the Protestants at the present day, had long continued to reject the absurdities of Popery;[1] and though, for several ages, they had escaped the notice of the Holy See, yet having in the twelfth century become exceedingly numerous, they excited the utmost hatred of the Pope and his adherents. About the year 1200, accordingly, Pope Innocent III. wrote to several archbishops and bishops in Guienne, and other provinces in France, enjoining them to banish the "Waldenses, Puritans, and Paternines," from their territories, and commissioned Regnier and Guy, two zealous monks, to repair to France, for the purpose of discovering and subduing heresy. These two apostles of the Holy See may now be considered as having laid the foundation of the Inquisition, though the honour, or rather infamy, of erecting that horrid court, is due to another individual no less cruel. Regnier was subsequently appointed the Pope's legate in the four provinces of Narbonne, Aix, Arles, and Embrun: but having fallen sick, Innocent joined to him Peter of Castelnau—one, says Sismondi, "whose zeal, more furious than that of his predecessors, is worthy of those sentiments which the very name of the Inquisition inspires."