"When the Germans invaded the Roman Empire they did not intend to destroy it. They were coming for plunder, to get the best lands and to settle down and enjoy the good things of life. They were happy to acknowledge the emperor’s rule. But the trouble was that in the 400s so many Germans came, and took so much land, there was nothing left for the emperor to control. In effect the Roman Empire came to an end because there was nothing left to rule."