Within its double belt of walls and half a hundred towers is the precious little church of St. Nazaire, once of cathedral rank. Its western front was never opened by a portal because it stood near what were long the outer ramparts. The Romanesque nave is small and dark, without triforium or clearstory, and with high aisles that buttress the tunnel vault of the principal span, whose transverse ribs are slightly pointed. Piers and columns alternate. The materials to build this early church were blessed by Urban II in 1096 in the same month that he dedicated the new choir of St. Sernin at Toulouse. St. Nazaire was an entirely Romanesque church when Simon de Montfort ruled the Cité for ten years. In this church St. Dominic married Amaury de Montfort to a princess of Dauphiny. St. Dominic had held a public controversy of eight days with the heretics of Carcassonne in 1205, before the coming of the northern barons, and in St. Nazaire he preached the Lent of 1213. Simon de Montfort was buried temporarily in St. Nazaire, and there exists in a nave chapel a sculptured stone which some have thought to be part of his sepulcher, but which is more probably from the tomb of a brother of Count Raymond of Toulouse, who, having sympathized with the northern barons, was slain in consequence. The curious stone shows the engines of war described in the _Chanson de la Croisade_, and the costumes of that period. Under Bishop Radulph (1255-66), who built the Gothic chapel beside the south arm of the transept, permission was obtained to replace the ancient transept and choir by a new one. Bishop Radulph won forgiveness for those citizens of Carcassonne who were expelled from the fortress in 1262, because they had conspired against the crown with one of the Trencavel dynasty, their old rulers, and the builders of the Cité's château. Louis IX, who governed Carcassonne through a seneschal, allowed the exiles to start the present town of Carcassonne beyond the river, in the plain below the citadel. The erection of the Gothic half of St. Nazaire took place under Bishop Pierre de Roquefort (d. 1321) during the first twenty years of the XIV century. To him we owe the radiant glass lantern which is St. Nazaire's transept and choir, a structure that is really a big transept with seven chapels, equally high, along its eastern wall, the central of which chapels, and the longest, serving as choir. The windows in the chapels rise to the roof, and are filled with clear and brilliant glass ranked with the best of the XIV century; those in the first two chapels excel the others. Two windows show the arms of Pierre de Roquefort. St. Nazaire was one of the last to use the legend-medallion type of window; henceforth, in each panel, a single figure was placed in an architectural setting.