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frontiers. To restore the elements of order a compromise between central and local jurisdictions was necessary, and the vassal became a local prince owning an allegiance, more or less real as the case might be, to a distant sovereign. Meanwhile, with the prevailing disorder the mass of the population in Western Europe lost its freedom, partly through conquest, partly through the necessity of finding a protector in troublous times. The social structure of the Middle Ages accordingly assumed the hierarchical form which we speak of as the Feudal system. In this thorough-going application of the principle of authority every man, in theory, had his master. The serf held of his lord, who held of a great seigneur, who held of the king. The king in the completer theory held of the emperor, who was crowned by the Pope, who held of St. Peter. The chain of descent was complete from the Ruler of the universe to the humblest of the serfs.[1] But within this order the growth

  1. This is, of course, only one side of mediæval theory, but it is the side which lay nearest to the facts. The reverse view, which derives the authority of government from the governed, made its appearance in the Middle Ages partly under the influence of classical tradition. But its main interest and importance is that it served as a