The principal mediæval edifice of Arles is the church of St Trophime, the patron saint. It is a large and important structure, containing specimens of all the peculiarities of Provençal architecture on a complete and extensive scale. The nave of the church was erected in the twelfth century, and is quite distinct in character from the beautiful western porch and the splendid cloisters which belong to the older and more ornate period of Provençal architecture. The choir and apse were rebuilt in 1430 in the Northern style. The nave (Fig. 74), like that of all the Southern churches of the same age is very simple internally. This is the first fine example we have met with of the second period of Provençal architecture--in which the plain and rigid Cistertian style superseded the earlier and richer architecture of which we have observed so many remarkable specimens. Thus the piers (Fig. 74) are merely square blocks of masonry, with flat projections or pilasters on each face, carried up to receive the small mouldings or imposts from which spring the wall arches on each side of the nave (between it and the side aisles), and the transverse arches, which strengthen the pointed barrel vault of the central nave. The latter consist of two rings, the inner arch springing from the main pier, and the side orders from fluted classic-looking columns introduced in the angles of the main piers to receive them. The side aisles are very narrow and lofty, and are roofed with one half of a pointed vault thrown as an abutment against the upper part of the nave wall. The nave windows are flanked by twisted columns with Romanesque caps. The pointed arches, resting on four strong piers, which carry the central tower, are seen at the crossing of the church, with a lofty plain wall forming the lower part of the tower, resting upon them. This partially cuts off the view of the choir from the nave, and indicates that the vault of the original church was much lower than that of the existing nave, the roof of which is nearly twice the height of the arches of the crossing. The latter, forming the support of the tower, could not be removed when the nave was rebuilt and enlarged. The tower (Fig. 11) rises high above the roof [Illustration: FIG. 74. ST TROPHIME, ARLES.] of the church. It extends to three full storys and an attic crowned with a pointed roof having a very flat slope. The two lower storys have the arcaded Romanesque ornament so common in Lombardy and Germany, while the upper story shews three Corinthian pilasters on each side. The tower is heavy, but recalls the general effect of the Italian campanile, and corresponds in style with the earlier work of the portal and cloisters. [Illustration: FIG. 75. WEST PORTAL OF ST TROPHIME, ARLES.]