Comments by "Laurence Fraser" (@laurencefraser) on "Viking Expansion - Rollo the Walker - Part 2 - Extra History" video.
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Depends how many of his descendants married into the other royal (and high noble) houses of Europe. Being a descendent does not require that line of descent to follow the same path the crown passed down through, nor does it need to be the same line the dynasty's name passed down through (and dynasties/families get renamed from time to time too.). All it takes is for one link to have been a woman who had brothers around to inherit the name and all the titles and the lines can diverge, and nothing stops them meeting up again generations later.
After all, the house of Windsor was the house of... Was it colburg-saxgotha? Something like that. A German house, either way, before they came to the British throne. And either way, the European royalty intermarried so much that as of ww1 it was becoming a problem. (Though in the past they had married other high ranked nobility, who had married slightly lower ranked nobility, etc, often enough to prevent it becoming too much of a problem in most places most of the time)
So, yeah, much like most of asia can trace ancestry back to Gangis Khan, it would not be surprising if this was the case.
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