William the Conqueror makes us cousins. Do you have and Stewart or Bruce heritage?
I descend from all 3 too, cousin.
I think James Buchanan, widely regarded as the worst president in history, goes back directly to James I, last king of Scotland and first of the House of Stuart.
The older royalty, especially, was pretty good about spreading their seed around. My wife actually goes back to Henry VIII who diddled the sister of Anne Boelyn and produced an illegitimate daughter (at least) some years before marrying Anne then having her beheaded on invented charges.