This study redefines Pompeii's fortifications as a central monument that physically and symbolically shaped the city. It considers the internal and external forces that morphed their appearance and traces how the fortifications served to foster a sense of community. The city wall emerges as a dynamic, ideologically freighted monument that was fundamental to the image and identity of Pompeii. The book is a unique narrative of the social and urban development of the city from foundation to the eruption of Vesuvius, through the lens of the public building most critical to its independence and survival.