We like to trace our ancestry back to the Mayflower. The Brits like to trace back to the Norman invaders.
I read the Bible and I know my earthly genealogy goes back to Adam and Eve.
tens of thousands can do both - it's a great way to learn history
i would find any ancestry claim pre-plague to be dubious. there is pretty much no documentation, it is all claim based. I am sure some % are true and a much higher % are believed to be true but outside of the royal line there is a lot of wiggle room.