This city's impressive cathedral has free-standing walls leading off of it that were originally mean
This city's impressive cathedral has free-standing walls leading off of it that were originally meant as the walls of a new and larger cathedral, the building of which was halted by the Black Death. The city never recovered from the plague and lost prominence to a rival that it had beaten in 1260 at Montaperti. The head of its most famous resident is enshrined in this city, but the remainder is in Rome, the city to which she was instrumental in returning the Papacy. For ten points, name this city in Tuscany whose Piazza del Campo is the site of the Palazzo Publico and an annual horse race called the palio, and whose patron is St. Catherine.
This city's impressive cathedral has free-standing walls leading off of it that were originally meant as the walls of a new and larger cathedral, the building of which was halted by the Black Death.
{Siena}