The process of the development of the feudal polity of the Middle Ages is, of course, a very complicated one, owing to the various strands that go to compose it. In addition to the German tribes themselves, who moved _en masse_, carrying with them their tribal and village organization, under the overlordship of the various military leaders, were the indigenous inhabitants amongst whom they settled. The latter in the country districts, even in many of the territories within the Roman Empire, still largely retained the primitive communal organization. The new-comers, therefore, found in the rural communities a social system already in existence into which they naturally fitted, but as an aristocratic body over against the conquered inhabitants. The latter, though not all reduced to a servile condition, nevertheless held their land from the conquering body under conditions which constituted them an order of freemen inferior to the new-comers. To put the matter briefly, the military leaders developed into barons and princes, and in some cases the nominal centralization culminated, as in France and England, in the kingly office; while, in Germany and Italy, it took the form of the revived Imperial office, the spiritual overlord of the whole of Christendom being the Pope, who had his vassals in the prince-prelates and subordinate ecclesiastical holders. In addition to the princes sprung originally from the military leaders of the migratory nations, there were their free followers, who developed ultimately into the knighthood or inferior nobility; the inhabitants of the conquered districts forming a distinct class of inferior freemen or of serfs. But the essentially personal relation with which the whole process started soon degenerated into one based on property. The most primitive form of property--land--was at the outset what was termed _allodial_, at least among the conquering race, from every social group having the possession, under the trusteeship of his head man, of the land on which it settled. Now, owing to the necessities of the time, owing to the need of protection, to violence, and to religious motives, it passed into the hands of the overlord, temporal or spiritual, as his possession; and the inhabitants, even in the case of populations which had not been actually conquered, became his vassals, villeins, or serfs, as the case might be. The process by means of which this was accomplished was more or less gradual; indeed, the entire extinction of communal rights, whereby the notion of private ownership is fully realized, was not universally effected even in the West of Europe till within a measurable distance of our own time.[3]