Hi Iago
Thank you for this exciting (to me) information. Some of the Welsh names, being similar, are often difficult to work out. I am currently awaiting the death certificate of Selina, which I hoped would supply more information. In the 1841 Census (HO 107/1368/12) Division of Yscirfawr (which you refer to ) Parish of Merthy Cynog, it shows John Williams Farmer, aged 50 with Elizabeth aged 45, and 10 children, I assume to be theirs - the 1841 not giving away all that much - of the 10 children, there is a Selina aged 9, and without positive proof as yet, I am working on the assumption she is the Selina who married Thomas Davies. Only a parish register would prove this of course. In the 1851 Census, Parish of Merthyr Cynog (HO107/2489) there is a Benjamin Davies farmer of 50 acres at Tygwyn, who has a 21 year old son named Thomas, and I believe this is the Thomas who married Selina Williams. It seems quite likely that the daughter of one farmer, would marry the son of another farmer. Do you know what they would have farmed in those days in that area? All very interesting, trying to piece these things together.
Regards from Genieflower