THE DENSEST of the medieval centuries—the six hundred years between, roughly, A.D. 400 and A.D. 1000—are still widely known as the Dark Ages. Modern historians have abandoned that phrase, one of them writes, “because of the unacceptable value judgment it implies.” Yet there are no survivors to be offended. Nor is the term necessarily pejorative. Very little is clear about that dim era. Intellectual life had vanished from Europe. Even Charlemagne, the first Holy Roman emperor and the greatest of all medieval rulers, was illiterate. Indeed, throughout the Middle Ages, which lasted some seven
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