Built on the orders of Hadrian after he became Roman emperor and visited by him in AD122, the Wall defined the north-west frontier of the Roman Empire, covering 73 miles from east to west. It boasted 80 milecastles with two turrets between each,  17 larger forts and a defensive earthwork, the Vallum, to the south. Abandoned briefly shortly after it was built, it was in active use for some 300 years and garrisoned by auxiliary soldiers from across the Empire .

Explore the history of Hadrian's Wall using the links below.

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