Hadrian's wall was a defense against what group?

Answer 1

Surprisingly, no exact explanation of the reason for Hadrian's Wall survives and potential explantions vary. Hadrian was the Roman Emperor from 117 to 138 CE. He traveled to nearly every province of his empire and began the construction of the wall in 122 CE. According to his biographer, the wall was built to "separate Hadrian from the barbarians" by preventing attacks on Roman territory and controlling the crossing of the border, which is located in present-day northern England. However, other theories have been presented that say the wall was simple yet impressive expression of Roman power or perhaps it supported Hadrian's traditional policy of providing defenses before expanding. These theories have taken hold because many researchers disagree over how much of a threat Northern Britain really posed and whether or not a wall was actually necessary, instead of just conquering the peoples and territories to the north of the 80 mile long wall.

Answer 2

The Picts.