 This facility served as a city gate for a long time and was turned into a "castrum" in the 11th century, although it lost the internal structure of the "cavaedium" over the centuries.In 1404, after centuries of incursions and partial decay, the western tower was rebuilt and both towers got completed with battlements for defensive purposes.The Palatine Gate was supposed to be torn down in the early 18th century, pursuant to the urban renewal process started by Vittorio Amedeo II.