 The map is composed of 12 copper plate engravings that together measures by and was published in response to the commission of Pope Benedict XIV to survey Rome in order to help create demarcations for the 14 traditional "rioni" or districts.It was by far the most accurate description of Rome produced to date at a time when the architectural achievement of the Papacy was in full flower.Born in 1701 in Castiglione d'Intelvi (Como), he moved to Rome thanks to the patronage of members of the patrician Albani and Corsini families.