In France the IX and X centuries were periods of overwhelming disaster. In the Midi were Saracen incursions. In northern and central France Norman pirates wiped out Charlemagne's revival of art. As far as Poitiers and Clermont the Northmen's path of destruction extended. "Look where you will," wrote Flodoard, the chronicler, "the sky is red with fires." To the litany was added a new invocation--_A furore Normannorum, libera nos, Domine_. The falling to pieces of Charlemagne's civilization and the general return of social disorders have led to an overdramatic contrasting of the year 1000, when mankind, in terror, anticipated the ending of the world, with the rebirth of hope and of building energy, when the dread day had passed. Whenever the gaunt horses--famine, pest, war, and death--are afoot, humanity is prone to look for the fulfillment of the apocalyptic prophecy. Previous to the X century the final day had been awaited, and the same superstition was to seize on the world's imagination in following centuries. The X century was certainly a desperate age. Fifty years of it were famine, and on the highroads people were killed for food. But the evils did not cease precisely with the year 1000; also it should be noted that a certain number of churches were begun before the XI century opened. However, to mark the start of a new art life the year 1000 is a convenient date if we bear in mind that it was not a sharp division between Carolingian and Romanesque architecture, since a gradual evolution took place. All through the XI century the vital renewal of architecture went on, and churches were built which, to this day, are unrivaled for their profound religious spirit. They exist to tell us that in the harsh life whence they emerged there were enlightened cases. They vindicate, by their grand simplicity and detachment of soul, the men who built them. Never was an art less one of routine than this of the so-called hidebound monks, an art of a people reborn, full of youth's daring, an art that was never to have an old age, eager, untiring, experimental, an art that fitly generated the most scientifically sound of architectures--Gothic. The heterogeneous races, Celtic and Gallo-Roman, Germanic, and Norse, whose conflicts long had held France in anarchy, were at last welding into one people. The advent of a vigorous third dynasty, under whose leadership social conditions improved, was another cause of art's rebirth. Not long after 1000 the bishops formulated the _Trève de Dieu_, by which peace was enforced on the turbulent lords from Wednesday night to Monday morning. With interval of peace came commerce and wealth and the security necessary for works of the imagination. The rebuilding of churches was inevitable.