by Isobel Lee Ancient cities like Rome were always surrounded by walls, to keep out invaders and establish the limits of the city. You can still see fragments of the early walls or mure Aureliane constructed by the Emperor Aurelius between 271 and 275 AD on a Rome tour, which were built to contain the seven hills, Campus Martius, and the district of Trastevere Rome on the west side of the river Tiber. While most of the masonry has vanished, many of the stately gateways into t