Persistenze e trasformazioni del tessuto urbano romano nel Medioevo

The anaIysis of the urban development and continuous occupation of the historicaI nucleus of a town must begin with its foundation and be aided by a detailed archaeologicaI map. This is the ooly way tbat a plausible hypothesis can be built up on the nature, times and causes of change in the originai appearance. A description is given of severaI expositions carried out by different criticai means, ranging from tbe tables of the Istituto Geografico Militare, detailed plans, històricaI and computerized cartography, aiming at tbe reconstruetion of tbe originaI 'forma', and an attempt to explain any changes which may have taken pIace.