I'd suggest if there are records going back that long, then they definitely have 'posh' ancestry. Either that or lots of major criminals. Although the two aren't exactly exclusive...
Most of his family tail off after a three or four hundred years (which is still fucking amazing IMO), it's only when you hit an aristo that the trail hots up and once you get into royalty, like his does TWICE, you're on Easy Street.
I'd suggest if there are records going back that long, then they definitely have 'posh' ancestry. Either that or lots of major criminals. Although the two aren't exactly exclusive...