Entering Piazza del Duomo from Piazza della Cisterna, on the left you can see the Palazzo Comunale, which stands next to the staircase leading to the entrance of the Duomo (or Basilica Collegiata di Santa Maria Assunta). Opposite you can see the Palazzo that belonged to the Ghibelline Salvucci family, bitter enemies of the Guelph Ardinghellis, whose houses stood in the adjoining square with the "twin" towers. They say that these two towers, which were not identical in size, had been erected by the Salvuccis to bypass the Communal Statutes of 1255, according to which no towers in town could be higher than the Podestà's Tower (Rognosa). In order to boast their power and impudence, the Salvuccis built two towers: the base of the second one could be superimposed to the top of the first one, and the two towers, if ideally put the one upon the other, were definitely higher than the Communal Tower.