Hadrian's Wall
Noun
Meaning
an ancient Roman wall built by Hadrian in the 2nd century; marked the northern boundary of the Roman Empire in Britain
Source: WordNetExamples
After the death of Severus in 210 they withdrew south to Hadrian's Wall, which would be Roman frontier until it collapsed in the 5th century.
Archaeological evidence shows that Senecio had been rebuilding the defences of Hadrian's Wall and the forts beyond it, and Severus's arrival in Britain prompted the enemy tribes to sue for peace immediately.
By the year 400, southern Britain – that is Britain below Hadrian's Wall – was a peripheral part of the western Roman Empire, occasionally lost to rebellion or invasion, but until then always eventually recovered.
Constantine was able to spend a year in northern Britain at his father's side, campaigning against the Picts beyond Hadrian's Wall in the summer and autumn.
Hadrian's Wall was built along this line in 138 AD; apart from a number of temporary forays into Scotland, this was now the border.
Events Pieces of Hadrian's Wall remain near Greenhead and along the route, though large sections have been dismantled over the years to use the stones for various nearby construction projects.