The Barbarian Invasions of Italy

What caused the fall of the Roman Empire? The first reply that occurs to us is this: That the Romans were corrupt and enfeebled by corruption; the Barbarians, while rougher, were also stronger and less corrupt. When the latter had once crossed the Rhine and the Danube, their ultimate victory was assured; the Empire was bound to fall, new social conditions were bound to arise. But what had corrupte...