Piazza Roma has an arty fountain that provides a good foreground for the sandstone Tower of Marianus II, also known as the torre di San Cristoforo, due to St Christopher being the patron saint of travellers. The tower is 19m high and one of the few remaining parts of the city’s 13th century walls. It was built in 1290 under the giudice of Arborea Marianus II and served as the northern gate to Oristano, acting as a key point of defence for the city. The bell that hangs within it was added in the 15th century.