Interesting read.
Yes, at one time, the Scots were dangerous.
@Sanguine It was the Picts,not the Scots that ruled that area when the walls were built,and they were built by the Romans to keep the Picts out,because once they found out the Romans were there,they wanted to keep attacking them. It was the Picts that convinced the Roman Empire that "this is where we stop. No further!"
There are no pictures of what the Picts looked like,but a Roman historian described them as "giants with red hair that liked to paint their bodies blue and charge into battle naked". These people were unbelievably clannish and violent,and there is at least one story of two different clans camped out on a hilltop the night before a battle with the Romans,fighting each other.
Nobody really knows what happened to the Picts,but it is MY theory that the wilder newcomers to this area from northern Spain that later became the Irish bred with them (voluntarily or involuntary) and the result is what is known as "The Highland Scots" of today.
BTW,it is said that the Highland Scots of today still don't care much for the lowland Scots of today,who are basically British or Irish. Seems like some things never change.