Porta Praetoria was one of four entrances to the town and is the only one still perfectly preserved. The gateway had two towers and had three openings, which are still visible today: the central one was for carriages and the side openings for pedestrians. The area inside the openings was used as a troop parade court. Porta Pretoria was also defended by a garrison.
The external eastern facade still shows the grey-green and white marble covering, realized during the 1st century AD.
During Middle Ages the towers were a property of the Porta Santi Ursi family and the gateway had also a chapel dedicated to the Most Blessed Trinity which had been destroyed during the 20th century.
Discover here the guided tour of the Roman and Medieval town of Aosta