Roger,
Thanks for your replies and also those on the other post which I had been meaning to respond to, but will do so here for ease.
This information about John Lewis Jones, and also John Lewis (nephew of Robert Evans) in the previous post is interesting and I will look into this. I am pretty certain however that the father of John Jones, Llechwedd (husband of Dorothy) was John (b.1709, brother of Foulke), son of Thomas Jones and Elizabeth Foulkes - his wife is Blanche Edwards, and John Jones, Llechwedd, has a granddaughter Blanche also. The will of Foulk Morgan leaving his lands to Elizabeth Foulkes makes me of course wonder if it is the same woman as the wife of Thomas Jones - they marry though in 1703, and the first child I can find is John in 1709, and the only other Foulke in 1715, so I wonder if they had other children baptised in another parish.
I am still trying to find any information proving that John Jones (d.1705), is the same as the John Jones, Ty Ucha, Tyfos, cousin of Maurice Jones, and nephew of Nathaniel Jones, and grandson of Maurice Jones, which is proving difficult.
I have found a few pieces about a Moris Jones (I estimate he'd be born around 1600), roughly in the same period at the NLW catalogue: - one of which (which I can't locate now) I'm pretty sure mentions him in a deed with John Foulkes.
Finally, there is another Jones/foulke family I am looking at to see if they are in any way related to the one I am tracing:
Ellen Foulkes, is the daughter and heiress of John Foulkes, Cilan (d.1663, who again is descended from Owain Brogyntyn) and Catherine Meyrick (d.1677). She marries Gabriel Jones and has children: Watkin Jones (d. 1682), Catherine Jones (d.1682), Jane (who marries John Evans, Dinan), and Mary (b. 1662), marries John Lloyd. I think Gabriel Jones may have had an aunt Gwen ferch Maurice whose will is (1674, Llandrillo) - I wonder if she is a daughter of Maurice Jones (father of Nathaniel and grandfather of John). Mary Powell (d.1681) seems to be related in some way, as has a grandson Watkin Jones, though doesn't appear to match up exactly.
hanes teulu,
Thank you for pointing out this - a useful resource!