The evolution of Rome's topography, particularly the relationship between intra muros and extra muros spaces has always been the focus of countless studies concerning the most different aspects of the city. Scholars have always been interested in the theme of the relationship between the urbs a space reserved for the living, and the suburbium for centuries intended essentially for the dead, and the boundaries that determined this division: the Servian and Aurelian walls, which played an important defensive role, and the Pomerium, the sacred-legal boundary of the city. However, the relationship between urban and suburban spaces gradually changed from the republican period until Late Antiquity. A significant change can be identified in the mid-3rd century AD with the construction of the Aurelian Walls, which seem to have "absorbed" the pomerial circuit, creating areas with different characters, such as boundary areas defined as "borderlands" with fluid settlement characteristics, typical of both the urbs and the suburb. The intent of this contribution is precisely to illustrate this change throughout the analysis of two sample areas with different settlement characteristics: the necropolis along the via Salaria Vetusand the area between the via Appia and the via Ardeatina.
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