John Portrey was born after 1693, so may not have been old enough to be in any position by 1715

As for the rest, the more I learn, the less I know!

I was searching for Portreys in Ystradgynlais and I've got people I have no idea who they are. I ASSUME it's a collateral line, and as succession to the manor and estate is not the same as to a dukedom (heirs male, entail) it went to the simple route, the female heir of the last male, rather than to male collateral branches.