Important example of Apulian Romanesque. Under the transept lies the crypt, transformed in the 18th century. There is the Byzantine table of the Virgin Odegitria, principal patroness of the city with Saint Nicholas.
In the Curia Palace, adjacent to the Cathedral, is the seat of the Diocesan Museum, which houses the Exultet, a precious Byzantine-inspired parchment, finely, before 1050 miniata. The images are flipped relative to text and then compared to the priest who read it. In this way the faithful, when the celebrant unrolling Easter prayer could watch the sacred designs. Among others who knew no Latin could get an immediate idea of the story.