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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 (r. A.D. 117-138) was a Roman emperor known for his many building projects, cities named Hadrianopolis (Adrianopolis) after him, and the famous wall across Britain, from Tyne to Solway, designed to keep the barbarians out of Roman Britain (see map of Roman Britain).