The vaulting of the nave and aisles and the beautiful cloisters were added in the 13th century.
The vaulting of the nave takes the form of a series of cupolas, and that of the choir and transept is similar.
In the interior, which is without transepts or aisles, the roodscreen and the choir-enclosure, which date from about 1500, are masterpieces of delicate sculpture; the vaulting and the walls are covered with paintings of the 15th and 16th centuries.
The principal characteristics of this second period are the magnificent portals, rising sometimes, as in the mosque of sultan Hasan, to 80 or 90 ft., with elaborate stalactite vaulting at the top, and the deep stalactite cornices which crown the summit of the building.
The cathedral has a Romanesque Gothic portal of 1332 by a Roman marble worker named Deodatus, and the interior is decorated in the Baroque style, but still retains the pointed vaulting of 1154, introduced into Italy by French Benedictines; it contains a splendid silver antependium by the 15th-century goldsmith Nicolo di Guardiagrele (1433-48).
The choir opens into a beautiful cloister, the massive vaulting of which is supported on heavy piers adorned with statuary, between which intervene slender columns arranged in pairs and surmounted by delicately carved capitals.
He hesitated before vaulting to the ground, unable to explain the quickening of his heart or the sense that the woman's teal gaze - the color of the eyes of Karyan nobility - reminded him of the home he hadn't thought of in years.
But it is important to add that the permanent forts were old and conspicuous, and, except in a few cases where modernization had been actually begun, possessed only brick vaulting that was not proof against 6-in.
Of the apartments, all of the finest Gothic architecture, the chief are the refectory, divided down the centre by columns and lighted by large embrasured windows, and the knights' hall, a superb chamber, the vaulting of which is supported on three rows of cylindrical pillars.
In the town itself there are no Roman remains; but there is a good Gothic cathedral in brick, and an interesting octagonal baptistery, attributed to the 8th or 9th century, the arches being supported by ancient columns, and the vaulting decorated with mosaics.