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| Hadrian's Wall was built, beginning in 122, across Britain, to keep Roman Britain safe from hostile attacks from the Picts. It was the northernmost boundary of the Roman empire until early in the fifth century. The wall, stretching from the North Sea to the Irish Sea, was 80 Roman miles long, 8-10 feet wide, and 15 feet high. In addition to the wall, the Romans built a system of small forts called milecastles every Roman mile along its entire length, with towers every 1/3 mile. |
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