I'm still trying to find my book with notes about the various Trecastle/Llywel families, but I do have information on one branch of the Davies family. They lived at The Bear, Trecastle, where we moved to in the 1980s, it then being called Bear House. It was a former pub, but later used by a stone mason so the gardens were strewn with pieces of stone cherub and half-finished gravestones. It was a lovely place; I wish I still lived there.
The Davies family as they appear at Bear, Trecastle in the 1911 census are:
Thomas Davies, widower, Stone Mason, aged 74 (so born abt 1837), Trallong (his wife's name was Elizabeth)
William Davies, married, aged 29, Stone Mason, born Trecastle
Harriet Davies, wife of William Davies
Violet Elizabeth Davies aged 7
Thomas Gordon Davies aged 2
David Brychan Davies aged 6 months
I'm wondering if this Thomas Davies is one of those you are looking for?
Regards
GS