The construction of the cathedral at this period can be seen as resulting from a coming together of necessity and opportunity. The destruction of earlier buildings and attempts at rebuilding by fire forced the fairly rapid construction of a building that, consequently, has a good deal of artistic unity. The long and relatively peaceful reign of Louis IX of France brought a prosperity to the region, based on thriving agriculture and a booming cloth trade, that made the investment possible. The great cathedrals of Reims and Chartres are roughly contemporary.