Tired of the  battles fought in the area at the time between Florence, Lucca and Pisa, the population of nearby villages Vigesimo, Catiana, Paterno and Carpugnana decided to build here a defensive castle,  named Castello di Franco, later changed to  Castelfranco.
Due to ongoing battles between Florence, Lucca, and Pisa in the area, the people of nearby villages Vigesimo, Catiana, Paterno, and Carpugnana built a defensive castle called Castello di Franco, which was later changed to Castelfranco.