Which Roman emperor built a wall right across England?

Question

full name please

Answer 1

Publius Aelius Traianus Hadrianus known asThe Emperor Hadrian
Hadrian became Emperor in 117 AD the Roman Empire had ceased to expand. Hadrian was concerned to consolidate his boundaries. He visited Britain in 122 AD, and ordered a wall to be built between the Solway Firth in the West and the River Tyne in the east a total distance of 73 miles"to separate Romans from Barbarians".