This conclusion presents some closing thoughts on the key concepts discussed in the preceding chapters of this book. The book reviews the main literary sources related to Securitas and to synonymous expressions that define it. In the climate of literary and philosophical circles of the late Republic and Early Principate terms like Tranquillitas, Concordia and Pax and, with a more timid presence, Securitas, become keywords of the cultural debate. The book draws Augustus' lines of action in reorganizing the territorial structures of Rome and coordinating the governors, at varying degrees, to ensure the security of the city and the safety of its Princeps. It highlights how the cohorts created or reformed by Augustus had received and then kept a number of skills that had as a key point the security of the Princeps and of the city; and the implementation of prevention and intervention strategies that involved the cooperation of the civil forces.