The Porte d'Arroux is distant only a few minutes walk from the Temple of Janus, near the river, at the foot of the Faubourg d'Arroux. Incomplete though it is, the grace and dignity of the fallen monument yet contrast strongly with the squalor of its setting. It is backed, on either side, by a medley of disreputable villas, and dilapidated, half-timbered cottages, whose squalor is not without charm. To-day hordes of ragged children play beneath the arches that once echoed to the roll of chariot wheels, and to the tramp of lictors' feet. [Illustration: PORTE D'ARROUX · AUTUN ·] The Porte d'Arroux has four openings for traffic,--two large central arches, by which chariots could pass in and out, and two smaller gates, at the sides, for foot passengers. Each of the central arches is grooved for a portcullis, which some authorities, including M. Viollet le Duc, think were not added till the middle ages,[27] a supposition that M. de Fontenay seems effectually to disprove by pointing out that, since the Roman rampart at that period was broken down in many places, any additional defences to the gates would have been a useless precaution. Autun, in mediæval times, comprised what were, in effect, two distinct towns, both built within the Roman enceinte. These were the Castrum, the centre of which was the Cathedral of St. Lazare, and the Marchaux--still known by the same name,--in the lower part of the town, north of the Place des Champs de Mars. Each of these towns was then sheltered within its own walls and towers, of which portions are still in existence. The upper part of the gate consisted of a pierced gallery or arcade, of ten bays,--seven of them still intact,--forming a Chemin de Ronde, on a level with that running along the crest of the Roman wall. This gallery, serving the double purpose of ornament and defence, could be closed at any time by wooden shutters.[28] The gate was flanked on either side by two rectangular towers (corps de garde) with semi-circular apses projecting far beyond it, as though--in the phrase of Eumenes, a local historian and orator of the late 3rd and early 4th centuries--they were stretching out welcoming arms to those about to enter the town.[29] All who are interested in the development of Burgundian architecture, should give careful attention to the Porte d'Arroux, which is certainly the source of one of the most marked characteristics of the style,--the use of the fluted pilasters, which, for some reason or other, seem to have struck the fancy of the architects of this part of France. We shall see this arcade imitated closely in the triforium gallery of the cathedral of St. Lazare, and also influencing, in turn, the churches of Cluny, Paray le Monial, Notre Dame de Beaune, and others.