Apologies in advance, i'm writing on my phone - need a telescope.
Anyway, tidying my files and I came across research on Mary and I Googled Mary Kelly with Cwybargoed - of course I landed on this site.
Read through this whole thread. John Davies who died in 1881 and born 1855:
On my notes I have his address it's 18 Lewis Street from the inquiry into his death. At that address he is listed as born Llandovery, ...Carmarthenshire. His wife was called Margaret and was 23 when he died.
They had two boys, David and Howell who isn't living with his mother in the 1891 census not too sure of David. In the house are two Irish lodgers one of which comes from Catletown...limerick.
Cymbargoed also had an ironworks but it's also close to Cardiff.
Just one more snippet in my notes I've written. Margaret Leyshon - 7 brothers-Henry , a sister and a father called John - nothing ekse on it and that info I must have dumped for some reason.
Lastly there's a John Sheen working at the ironworks, that name's familiar to people studying Pearly.
That's it I think. Still that's only the first folder sorted ...