Rione XVIII Castro Pretorio on Tavola 18, with the Castro Pretorio barracks at the right and the arc of Piazza della Repubblica at lower left.
Source: Old map, public domain
The large rectangle of the Castro Pretorio compound, drawn with rows of barrack blocks, fills the right side. Teatro dell'Opera and the streets of the Piazza della Repubblica sit at lower left, with the Ministero del Tesoro among the green plots to the north.
