Mantes' Primary Gothic church was begun about 1160, at the same time as the cathedral in the capital, but, being on a lesser scale, it was finished sooner, and thus appears more archaic. Normandy's Romanesque zigzag ornamentation was still retained, and the cells of certain vault sections show the hesitating rough work of masons as yet unpracticed. While the transverse arches are pointed, those of the diagonal-crossing ribs are round. Too wide an expanse of plain wall space was left between tribune and clearstory, for it was to take half a century longer before architects dared fill their entire upper wall with windows. Like Notre Dame of Paris, the tribunes open on the middle church by wide, graceful arches. And this smaller Notre Dame also has western towers that are connected by an open colonnade. The collegiate has no transept, and one recalls that neither had Paris Cathedral in its first plan. The flying buttresses here are among the first ever made. A striking feature of the exterior of the church is the row of little oculi that light the tribunes over the aisles, some of which have been changed to windows of Rayonnant tracery. The deep galleries once were entirely vaulted by transverse half cradles borne on low lintels, an experiment in masonry roofing first tried at Tournus, but which never became popular; at Caen the tribunes of the Abbaye-aux-Hommes had been vaulted by similar half cylinders whose axial lines were at right angles to that of the nave. The first Gothic rose window of big dimensions adorns the west façade of Mantes collegiate. It is what they call plate tracery--that is, the pattern is formed of voids, the window being a group of variously shaped openings, and not, as in bar tracery, a single opening with the pattern made by solids, or stone mullions. The western rose at Laon stands halfway between plate and bar tracery. Mantes' rose was the prototype for that at Chartres. Like most of the larger XII-century churches, the sexpartite system of vaulting was used. Mantes also followed Noyon and Senlis in having alternating piers and, like Noyon, it showed the Rhenish trait of a western transept, formed by the two lower stories of the towers and the westernmost bay of the middle vessel. Two of the portals are of the XII century, but the largest--the one under the south tower--was made by Raymond du Temple. And probably that same XIV-century architect of Charles V added the gracious chapel of Navarre which is among the best works of Rayonnant Gothic. In it are four charming statuettes of the donors, the princesses of Navarre, portrait work showing personal mannerisms. When the sister of the art-loving Valois king, Charles V, married Charles the Wicked (a scion of Capetian stock who was count in Évreux and king in Navarre) she brought the town of Mantes in her dowry, and it was probably her daughters who are sculptured in this chapel of Navarre--their gift to Mantes collegiate.