I'm uncertain of that, but I'm descended from 14 of the approved "gateway ancestors" referenced by the Baronial Order of Magna Carta on their website.
Oh, and John Lackland. Wouldn't want to leave him out.
Same here. Seventeen of the 25 barons had progeny and I am related to 14 of them. I know that Richard de Clare takes you straight to Charlemagne, and ultimately, Adam. Joseph of Arimathea was also in that lineage.