information:extraction, quality:corruption
Language

One of the most obvious effects of the conquest was the introduction of Anglo-Norman, a northern dialect of Old French with limited Nordic influences, as the language of the ruling classes in England, displacing Old English. Norman French words entered the English language, and a further sign of the shift was the usage of names common in France instead of Anglo-Saxon names. Male names such as William, Robert, and Richard soon became common; female names changed more slowly. The Norman invasion had little impact on placenames, which had changed significantly after earlier Scandinavian invasions. It is not known precisely how much English the Norman invaders learned, nor how much the knowledge of Norman French spread among the lower classes, but the demands of trade and basic communication probably meant that at least some of the Normans and native English were bilingual. Nevertheless, William the Conqueror never developed a working knowledge of English and for centuries afterwards English was not well understood by the nobility.