The outcomes of many Council of Trent sessions were announced in this 13th- to 16th-century cathedral, delightfully situated on the wide expanse of the cafe-filled Piazza Duomo. This square, with a statue of Neptune at its center, is referred to as the city's salotto (sitting room), so popular is it as a place to pass the time. The decrees that came out of the council were read in the Duomo's Chapel of the Crucifix, beneath an enormous 15th-century cross. Beneath the altar of the main church is the crypt-cum-basilica Paleocristiana, a 6th-century church later used as a crypt for the city's powerful prince-bishops. A few scraps of mosaic and carvings remain.