The Vikings didn’t disappear, they took over most of Europe. Most don’t know this but the Germans were a tribe that originated in southern Sweden before they went south and eventually conquered Rome. Following the Germans came the Vikings. They took over all of Europe and ruled it as royal dynasties up until World War I.
There was something rotten in Denmark................................
And England. The Vikings became the British aristocracy.
Some Vikings settled in Northern France, and became known as the Norman ("North Men"). In 1066, they invade the British Isles and conquer it.