One of the oldest wall circuits in Rome: The Servian Wall - Ancient Rome Live
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The Servian Wall was an ancient Roman defensive barrier constructed around the city of Rome in the early 4th century BC. The wall was up to 10 m (33 ft) in height in places, 3.6 m (12 ft) wide at its base, 11 km (6.8 mi) long, and is believed to have had 16 main gates. In the 3rd century AD it was superseded by the construction of the larger Aurelian Walls.