The Vandals, Goths, Huns, and Saxons in ancient history are usually associated with the fall of the Roman Empire. Most of our knowledge of these barbarian peoples is derived from writers whose contemporaries suffered during the invasions. Consequently we are impressed by the purely destructive side of their history, and often fail to realize that they had ways and means of earning their livelihood and that their whole time was not occupied in thinking of new and fiendish tricks to play upon their victims. It is true that within the Empire towns and cities flourished, that farms prospered, and that there was a numerous class of free proprietors, merchants, and workmen, and that slavery was almost nonexistent. It is also true that there was a high degree of prosperity with specialized capitalistic industry. All these things, moreover, disappeared or were wantonly destroyed, but this should not blind us to the fact that the barbarians had a primitive economy which they transplanted into the various parts of the Empire within which they settled. Thus, for instance, we can see their reliance upon nature to supply them with food, clothing, and shelter in the case of the Huns, the most destructive of the barbarian peoples, and we can see the more highly developed civilization of the Germanic peoples with their villages, collective property, cultivated fields, and slaves, and who, besides, indulged in a little commercial activity. We can deduce from the Farmer's Law the kind of agrarian economy which probably sprang into existence in a multiplicity of forms all over Europe as soon as the shock of the invasions was spent. Adapting existing Roman systems to their own, and assimilating the principle of private property, they gradually developed the idea of the manor and villa, the prevailing rural units of the Middle Ages.