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 "History of the Intellectual Development of Europe" will give an idea of this achievement:

Scarcely had the Arabs become firmly settled in Spain than they commenced a brilliant career. Adopting what had become the established policy of the Commanders of the Faithful in Asia, the Emirs of Cordova distinguished themselves as patrons of learning, and set an example of refinement strongly contrasting with the condition of the native European Princes. Cordova under their administration, at the highest point of their prosperity, boasted of more than two hundred thousand houses, and more than a million inhabitants. After sunset a man might walk through it in a straight line for ten miles by the light of the public lamps. Seven hundred years after this time there was not so much as one public