Mount Pianzio is a mountain located in the northeast quadrant of the historical center of Rome. This mountain is located to the north of Quirinal Mountain, overlooking the Place of Matthias. It is located outside the original boundaries of ancient Roman cities and is not one of the seven mountains of Rome, but it is situated within the city walls built by Roman Emperor Aurelian between 270 and 273. Villas and Gardens In the late Roman Republic, several important families owned villas and gardens on the southern slope, including the Lucius Garden created by Lucius, the Saluste Garden created by historian Saluste, the Pompeian Garden, and the Archillion Garden. This mountain was called Garden Mountain during the Roman era.