Hi ivorglyn, I am a very distant relative to this Thomas Gwynn. I am not sure if it is the Gwynne side of the family you are seeking or his wife's side? I am a relative from the Gwynne side of the family. Thomas Gwynn was my 8x great grandfather on my father's (Gwynne) side. We have not been able to trace our family line back past this point & unfortunately have no information on his wife's family either. We have a copy of his last will & testament & we believe he probably lived in Trellech. Several generations after him seem to have lived around the Trellech / Cwncarvan / Mitchel Troy areas, before crossing the border into England. I am originally from Parkend (where 5 generations of us are buried) in the Forest of Dean & now live in Australia. Several years ago we spent several days trudging around the churchyards of Trellech, Cwmcarvan & Mitchel Troy looking for old headstones as evidence of our early Gwynne ancestors but found very few clues!! We were only successful in Mitchel Troy, finding headstones from John & Elizabeth Gwynne family members & their siblings from the early 1800s. I am not sure if this is of assistance to you though?