I had a look the other day with no success, but found this one today. Don't think it's the Samuel of the will, but must be of the family - thought the will said Penhernwen nor heur!
1851 Pernhernwenfawr, hamlet of Treflys, Llangammarch HO107/2488 folio 30 pg 13
Samuel Davies head mar 37 farmer 128 acres b. Llangammarch
Mary wife 36 b. Llanwrtyd
Mary 12 employed at home b. Maesymynis
Elizabeth dau 10 b. Maesymynis
Ann dau 8 b. Llangammarch
Margaret dau 6 b. Llangammarch
Sarah dau 3 b. Llangammarch
Catherine dau 1 b. Llangammarch
Jenkin Jenkins lodger mar 37 hatmaker b. Cardiganshire, Llanbadarn Trefeglywa
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Elizabeth Davies head widow 66 b. Llanwrtyd
Elizabeth is in the same house, but enumerated as a separate household, could be Samuel's mother.
1841 has Samuel, 2 Marys & Elizabeth at Garthfach, Llechweddôr, Llanwrtyd. NO helpful family, but there's only a couple of farms in between him & Cwmbychan - Rhoderick family there. HO107/1365/23 folio 8 pg 1
Another possible relative?
1851 Penporth, Ystradfellte HO107/2463 folio 405 pg 4
Joshua Davies head mar 48 shepherd b. Llangammarch
Jane wife 38 b. Llangammarch
Sarah dau 1 b. Devynnock
Catherine Jones visitor widow 64 pauper shepher's widow b. Llangammarch
David Jones vis mar 32 ag lab b. Devynnock
Sarah Jones vis mar 27 ag lab's wife b. Llangammarch.