In brief, the historic events to be analysed through the archaeological investigation of the Montaccianico site and its area at the moment of destruction of Montaccianico in 1306, a necessary precedent for the founding of the 'Terra nuova' of Castel S. Barnaba , lend themselves particularly to an investigation of an archaeological nature of the wider phenomenon of the final crisis of feudal systems and the foundation of a system which locally denotes the new balances of power which were to form the basis of modern Europe throughout the XIV century.