At his death, the Empire was divided among his sons.

The Norse Vikingers continued their invasions; and to purchase repose, Charles the Simple ceded to Duke Rollo a large territory in the northwest of France, which in deference to their origin, was known by the name of Normandy.
There Norman-French was for a long time spoken.

Though the Franks had supplanted the Romans, the Roman language continued to be spoken.

In 996 Paris was made the capital of France; and from that time, the language of Paris became, with various modifications, the language of France; and not only of France, but the Roman or Latin tongue became the foundation of the languages of Italy, Spain, and Portugal.
Thus, Gaulish, Frankish, and Norman disappeared to give place to the Latin-French.

The Kymriac language was preserved only in Brittany, where it still lingers.