During the thirteenth century, new gates were opened, the most remarkable, Bab Lalla Rihana dated from 1293, is located on the eastern wall of the enclosure. The monumental entrance, work of the Hafsid sovereign Abu Hafs `Umar ibn Yahya (reign from 1284 to 1295), is entered in a salient square, flanked by ancient columns supporting horseshoe arches and covered by a dome on squinches. The front façade of the porch has a large horseshoe arch relied on two marble columns and surmounted by a frieze adorned with a blind arcade, all crowned by serrated merlons (in a sawtooth arrangement). Despite its construction at the end of the thirteenth century, Bab Lalla Rihana blends well with all of the building mainly dating from the ninth century.