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 of industry and commerce raised up new centres of freedom. The towns in which men were learning anew the lessons of association for united defence and the regulation of common interests, obtained charters of rights from seigneur or king, and on the Continent even succeeded in establishing complete independence. Even in England, where from the Conquest the central power was at its strongest, the corporate towns became for many purposes self-governing communities. The city state was born again, and with it came an outburst of activity, the revival of literature and the arts, the rediscovery of ancient learning, the rebirth of philosophy and science.

The mediæval city state was superior to the ancient in that slavery was no essential element in its existence. On the contrary, by welcoming the fugitive serf and vindicating his freedom it contributed powerfully to the decline of the milder form of servitude. But like the ancient state it