“there must be MILLIONS of descendants..”
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Faith.....and begorrah:
“Three million people in the world are descended from one Irish High King”
http://www.irishcentral.com/roots/niall-took-no-hostages-43038522-237784201.html
Descendants of signers of the Magna Carta are also descendants. There are a billion people in the world who descend from Charlemagne. There are even more who descend from King David, which just puts more meat into the fact that he was a real human being with real faults and virtues.