That part of the Alpine chain which extends between Turin on the east and Grenoble on the west is known as the Cottian Alps. This is the dwelling-place of the Waldenses, the land of ancient Protestantism. On the west the mountains slope towards the plains of France, and on the east they run down to those of Piedmont. That line of glittering summits, conspicuous among which is the lofty snow-clad peak of Monte Viso on the west, and the craggy escarpments of Genèvre on the east, forms the boundary between the Albigenses and the Waldenses, the two bodies of these early witnesses. On the western slope were the dwellings of the former people, and on the eastern those of the latter. Not entirely so, however, for the Waldenses, crossing the summits, had taken possession of the more elevated portion of the western declivities, and scarcely was there a valley in which their villages and sanctuaries were not to be found. But in the lower valleys, and more particularly in the vast and fertile plains of Dauphiné and Provence, spread out at the foot of the Alps, the inhabitants were mainly of cis-Alpine or Gallic extraction, and are known in history as the Albigenses. How flourishing they were, how numerous and opulent their towns, how rich their corn-fields and vineyards, and how polished the manners and cultured the genius of the people, we have already said. Innocent III. exacted terrible expiation of them for their attachment to a purer Christianity than that of Rome. He launched his bull; he sent forth his inquisitors; and soon the fertility and beauty of the region were swept away; city and sanctuary sank in ruins; and the plains so recently covered with smiling fields were converted into a desert. The work of destruction had been done with tolerable completeness on the west of the Alps; and after a short pause it was commenced on the east, it being resolved to pursue these confessors of a pure faith across the mountains, and attack them in those grand valleys which open into Italy, where they lay entrenched, as it were, amid dense chestnut forests and mighty pinnacles of rock. We place ourselves at the foot of the eastern declivity, about thirty miles to the west of Turin. Behind us is the vast sweep of the plain of Piedmont. Above us in front tower the Alps, here forming a crescent of grand mountains, extending from the escarped summit that leans over Pinerolo on the right, to the pyramidal peak of Monte Viso, which cleaves the ebon like a horn of silver, and marks the farthest limit of the Waldensian territory on the left. In the bosom of that mountain crescent, shaded by its chestnut forests, and encircled by its glittering peaks, are hung the famous valleys of that people whose martyrdoms we are now to narrate.