Abstract

Abstract:In his Descriptio urbis Romae, Leon Battista Alberti provides step-by-step instructions for how to draw the outlines of Rome. The image transmitted through Alberti’s text is so accurate that it is justly described as the first “map” of Rome after the Forma Urbis (3rd c. CE). Alberti's idea was sparked by the renewed reading of the works of Claudius Ptolemy: the Geography, but also—as I argue for the first time—the Almagest. I show how this image blends the ways that terrestrial and celestial territories are commonly depicted and gives a fresh interpretation of this cosmologically overdetermined city.