This will get searchers going !
Facts: in Penallt churchyard there is a box type tomb, bearing the following inscription on one of the side panels - "Thomas Chadwell of this parish, died Feb 1917, aged 68 years" (therefore born around 1849) It is very clear and easy to read, so no error on my part.
Firstly, weren't box type tombs late 18th century/ 19th century ?
Secondly, I have searched Free BMD, the relevant censuses up to 1911, the entire original parish records - (baptisms, marriages and burials) from about 1790 to the 1920's and he just doesn't exist, and seemingly, he doesn't have any relatives !
Over to you !!