Of the chapel built in the beginning of the twelfth century nothing remains but ruins, a view of which is given (_page 61_). It was situated on the first floor; a "semi-circular" arcade of the nave is still to be seen, on the right side. The ground floor, vaulted like an arbour, formed a passage. The priory of Saint-Maurice, of which one ivy-covered building still exists (visible on the right of the photograph at the top of the preceding page), was founded by Saint Louis in honour of Saint Maurice who commanded the Theban legion, massacred under Diocletian for refusing to worship false gods. In 1234 the king succeeded in obtaining the bodies of several of these martyrs from the vicar of Saint-Maurice-en-Valais. A church, copied from the Sainte-Chapelle in Paris, was built to shelter these relics, but was destroyed during the Revolution. Passing under the Roman enclosure by a subterranean passage, we arrive at the old moat transformed into a kitchen garden. From here, there is a very interesting view of the wall and the Roman towers, the cathedral and the castle. A good idea of it is given by the photograph at the foot of the preceding page. The Roman enclosure continues towards the cathedral, passes by the apse, from there to Saint-Frambourg, and its oval rejoins the castle by the Place de la Halle, the Rue aux Fromages, and the Rue du Puits-Tiphaine. It measured 312 m. (1,024 ft.) at its greatest diameter and 242 m. (794 ft.) at its smallest diameter; twenty-eight towers adorned the walls which were 7 m. (23 ft.) high and 4 m. (13 ft.) thick. The town, having grown, was cramped in the limits of the Roman city, so the new ramparts were raised between the thirteenth and sixteenth centuries; the tourist has already travelled over a part of them. The platform of the Roman fort, which was followed by the castle, stood on the part which (with the Rue Villevert) forms a corner of the estate. It is reached by the narrow passage, made in the thickness of the sub-basement, which led to the dungeons. It was in one of these (towards the year 870) that Pépin, King of Aquitaine, died, imprisoned by order of Charles the Bald, against whom he had revolted. Subterranean passages connected certain important points of the castle. They were supposed to lead as far as the Castle of Montépilloy (_see p. 67_) and the Abbey of Châalis (_see p. 70_). =The old Abbey of Saint-Vincent= _To view, apply to the concierge in the Rue de Meaux._ [Illustration: ABBEY OF SAINT-VINCENT] [Illustration: THE ABBEY CLOISTERS] The Abbey of St.-Vincent was founded in 1065 by Anne of Russia, wife of Henri I., King of France, in fulfilment of a vow. The abbey church was rebuilt in the twelfth century. The tower, which dates from that period, is square; it has two storeys with very high dormer windows grouped in pairs on each front, which give a very light appearance to the general structure.