Some additional information on Hafod Lwyfog
In 1851, two families are there:-
Ellin and Catherine Williams aged 23 and 25, both unmarried.
John Owens, a farmer age 21, and John Jones, a quarry-man and relative age 24.
In 1841 it is John Rowlands, age about 61, and his wife, Mary, age about 51. They appear in the pedigree and their children either have no surname or are Jones, including the two who married John Roberts.
David