Regio XI Sant'Angelo in 1777, with the Tiber bank at the bottom, Palazzo Orsini on the old theatre and Palazzo Mattei near the top.
Source: Old map, public domain
At the lower right Palazzo Orsini is drawn with its terraced garden, beside a curved outline lettered as a theatre. Palazzo Mattei and its fountain mark the upper centre, the cartouche sits on the right edge, and the Tiber fills the lower left corner.