The cathedral was built in the 13C and substantially reworked between the 17C and the first half of the 20C. In its current incarnation the cathedral is a veritable palimpsest of styles. Take a look at the two pulpits depicting scenes from the life of Christ, and the lions (nowadays at the entrance to the presbyterium), which originally formed a single ambo: an outstanding work by Guglielmo. Three chapels carved into the rock house the supposed remains of early Christian martyrs.