Hadrian was a roman emperor. Where his predecessors were going for expansion, Hadrian tried to consolidate the conquered lands and defend the vast land. He build several walls at the borders of his empire, one of which crossed England from Newcastle to Solway. Parts of the wall still stand and a trail leads hikers all the way across England for 135 kilometers.
Back in 200? I have conquered this trail together with my girlfriend back then, her brother, her sister and the boyfriend of her sister. It took us two weeks, this was my first multiple day hike.