Which the other Katharine just was…
Probably the most regrettable effect of the conquest was the total eclipse of the English vernacular as the language of literature, law, and administration. Superseded in official documents and other records by Latin and then increasingly in all areas by Anglo-Norman, written English hardly reappeared until the 13th century.
And see:
Has English been dialing down the effects of the Norman Conquest?
Catherine & Katharine 
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