According to Scientific American, "because Charlemagne lived before the isopoint and has living descendants, everyone with European ancestry is directly descended from him."
Some Europeans who take a DNA tests can see even their lineage directly traced back to the common ancestor. But before you jump at the chance to see for yourself, more than likely it won't pop up- even if you are a descendant of the Roman Emperor.
This is because bloodlines have been diluted and not all genes are passed on from parent to child. So while you may be vaguely related to Charlemagne, you may not carry any of the same genes.
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