The church of St Front at Perigueux had great influence on the subsequent architecture of Aquitaine and the West of France. The _plan_ of St Mark’s was not followed in other examples, the old traditional basilican plan being preferred and adhered to; but the dome raised upon pendentives, as introduced at St Front, became the common form of vaulting in Aquitaine and the West of France in the eleventh and twelfth centuries. In the churches thus constructed the side aisles are frequently omitted, and the building consists of a single hall, roofed with a series of domes resting on transverse arches, which are abutted with large internal buttresses. We thus find in Aquitaine and the South generally two important derivations from St Front, viz., 1st, the domed system of vaulting, and 2nd, the single or aisleless nave,--the latter being sometimes vaulted with domes and sometimes with groined arches. As late as the thirteenth century the influence of the dome made itself felt in the churches of Aquitaine, Poitou, and Anjou; while the influence of the plan of the single aisleless nave continued to be prominent in the churches of Languedoc long after the dome was abandoned, and even after the Gothic of the North had invaded the Southern provinces. It thus happens that early churches such as the Cathedrals at Toulouse (Fig. 34) and Fréjus (_see_ Part VI.) present a mixture of these ideas, being sometimes found designed on the plan of the aisleless hall, but at the same time roofed with groined vaulting. The buttresses in all these single nave churches are frequently internal, and form deep recesses, which are utilised as side chapels. At a distance from Perigueux as a centre, domes are sometimes used, as is the case, for instance, in Auvergne, but in Provence the dome is generally limited to the space over the crossing. In the latter locality the Byzantine influence exhibits itself in a different direction, being chiefly confined to details and subordinate features. But here another factor comes into play. The presence of the Roman monuments still existing in Provence has evidently tended to impress a Roman character on the architecture of the district. So strikingly indeed does some of the Provençal architecture resemble Roman work, both in general design and detail, that it has frequently been maintained that it is actually the work of the Lower Empire. The style of Provence in the twelfth century differs on this account considerably from that of the other Romanesque styles. The revival which took place all over Europe in the eleventh and twelfth centuries occurred in Provence also, but the result there was somewhat peculiar, the effect of the Roman remains being to produce in many of the features of Provençal architecture a closer resemblance to the Romanesque style of Rome and Italy than to that of the Rhineland and the North. [Illustration: FIG. 34. TOULOUSE CATHEDRAL.]