Emmanuel Philibert, Duke of Savoy
Several buildings were used over the centuries for the cathedral of the diocese. The first was the pieve of San Donato (12th century), which was replaced at the beginning of the 16th century by a new Renaissance church, which was demolished by order of Emmanuel Philibert, Duke of Savoy, in 1574. The church of San Francesco was then declared the cathedral, to be replaced in its turn by the present one, which was built between 1743 and 1753 to designs by the architect Francesco Gallo, and consecrated ten years later by Bishop Michele Casati.