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Hadrian's Wall was 80 Roman miles or 117.5 km (73.0 mi) long; its width and height varied according to the construction materials that were available nearby.
Hadrian's Wall. History of Hadrianâs Wall. Hadrianâs Wall was the north-west frontier of the Roman empire for nearly 300 years. It was built by the Roman army on the orders of the emperor Hadrian following his visit to Britain in AD 122.