Oh. I’ve done that!

But it is a very good question.

Looking at Hadrian the Roman.

Prior to Hadrian’s arrival in Britannia, the province had suffered a major rebellion, from 119 to 121. Inscriptions tell of an expeditio Britannica that involved major troop movements, including the dispatch of a detachment (vexillatio), comprising some 3,000 soldiers. Fronto writes about military losses in Britannia at the time. Coin legends of 119–120 attest that Pompeius Falco was sent to restore order. In 122 Hadrian initiated the construction of a wall, “to separate Romans from barbarians”. The idea that the wall was built in order to deal with an actual threat or its resurgence, however, is probable but nevertheless conjectural. A general desire to cease the Empire’s extension may have been the determining motive. Reduction of defense costs may also have played a role, as the Wall deterred attacks on Roman territory at a lower cost than a massed border army, and controlled cross-border trade and immigration.A shrine was erected in York to Brittania as the divine personification of Britain; coins were struck, bearing her image, identified as BRITANNIA .By the end of 122, Hadrian had concluded his visit to Britannia. He never saw the finished wall that bears his name.