come to be regarded as a degradation. In the words of Engels, "This brought the Roman world into a blind alley from which it could not escape.... There was no other help but a complete revolution."[93] The invading barbarians made the revolution complete. By the poor freemen proletarians who had been selling their children into slavery, the barbarians were welcomed. Misery, like opulence, has no patriotism. Many of the proletarian freemen had fled to the districts of the barbarians, and feared nothing so much as a return to Roman rule. What, then, should the proletariat care for the overthrow of the Roman state by the barbarians? And how much less the slaves, whose condition, generally speaking, could not possibly change for the worse? The free proletarian and the slave could join in saying, as men have said thousands of times in circumstances of desperation:-- "Our fortunes may be better; they can be no worse." VI Feudalism is the essential politico-economic system of the Middle Ages. Obscure as its origin is, and indefinite as the date of its first appearances, there can be no doubt whatever that the break-up of the Roman system, and the modification of the existing form of slavery, constituted the most important of its sources. Whether, as some writers have contended, the feudal system of land tenure and serfdom is traceable to Asiatic origins, being adopted by the ruling class of Rome in the days of the economic disintegration of the empire, or whether it rose spontaneously out of the Roman conditions, matters little to us. Whatever its archaeological interest, it does not affect the narrower scope of our present inquiry whether economic necessity caused the adoption of an alien system of land tenure and agricultural production, or whether economic necessity caused the creation of a new system. The central fact is the same in either case.