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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.
Best Answer: The Roman Empire knew it's (territorial) peak during the reign of Emperor Hadrian and the estimated size of the Roman army most probably formed a standing force of 375,000 men. This estimate probably included only legionary and auxiliary troops of the Roman army and not the navy, military engineers etc.