The area where San Casciano is located, was one of the most important of Tuscany as the village was situated on the ancient road which joined Siena to Rome.The village,fortified around the middle of the XIV century,was besieged and conquered by Alberigo da Barbiano in 1396.It had to stand another siege by imperial troups in 1478.
There are still visible parts of the fencing walls and square towers.
The area where 
