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Hadrian's Wall in northern England was built to mark the boundaries of the Roman Empire and to keep the Scots out. Constructed after the visit of Emperor Hadrian in 122 AD by the Roman army, Hadrian's Wall was constructed and protected by the Roman soldiers living in forts alongside it. The wall is 120 km long and was the furthest frontier of the Roman Empire, apart for the short time that the Romans occupied the Antonine Wall.