The first people who arrived in Europe 12,000 years ago were the Cro Magnons.
These people were nomadic deer hunters and the first barbarians. Six
thousand years later, the Homo Sapien barbarians were still learning to
make boats and live a nomadic lifestyle. 4200 B.C.E was when farming was
introduced, leading to pernament settlement. There was not much 
advancement until the Barbarians' Golden Age from 3000 to 2000 B.C.E.
Trade between other places made them rich. Imported bronze was made into
weapons and ornaments. Professor Rasmus Nyrup of Copenhagen University of
Denmark had a peculiar hobby of searching bogs for artifacts. He found them,
which proved that barbarians were not Romans.
The barbarians' first appearance in history was 101 B.C.E, when Cimbrian and Teutonic tribesmen went South from what is now Norway and Sweden into the northern borders of the Roman empire. When the Romans went to battle with these men, they cowered in fear because to them, they looked like demons. The encounter with these barbarians led to the biased image that we know as barbarians today. The Romans found the barbarians inferior, but only because they were different. The Romans called them barbarians, a Greek term meaning someone who enjoyed a different civilization. It was only in 1819 that we found clues about how the barbarians really lived.
So if the barbarians had such a splendid life, why did they attack the Romans? The answer can be dated back to the Iron Age. They NEEDED iron for their weapons and the Romans happened to have just that. But it was not enough, and the economy was so poor that the distinction between rich and poor no longer existed, as there was no more rich! Now everyone had to pull their own weight. Plus, the new and improved barbarians called Huns were attacking the old barbarians. The barbarians now looked to Rome for salvation.
Because of internal problems within the empire, the barbarians easily got through the borders. The Goths, a group of feared barbarians, actually migrated into the Roman empire. However, many weren't allowed inside and attacked. The Franks made deals with the Romans to let them in.
In 410 C.E, the barbarians rebelled and took over the Western Empire. They established their countries and put the title of Franks into use in Germany and France. Charlemange, the greatest ruler, fought 60 campaigns and was crowned by a pope of Italy. But this was a great insult to the barbarians and they burned all of the libraries and most of the churches. Very barbaric, huh?
Four hundred years later, the Anglo-Saxons took over Britain and called it Angle-land. Now say "Angle-land"- does that sound familiar? Yes, Angle-land was England. So these barbarians started some of the most powerful countries in the world. In 1000 C.E, the Vikings and Danes attacked. In 1065 C.E, the Normans, the descendants of the Vikings, took over England.
So the barbarians became normal by average human standards. In other
words, if you believed the biased version of the barbarians,
you could say they became "normal". But in reality, the Northmen should have
never been called barbarians.