Thanks Meleri. Bit of a blow in some ways as it's before the 1837 registration so won't get a certificate to see occupation etc. It does fit with why Emma was on her own in 1841. Shame it doesn't state married or widowed on her census return.
So, at the moment and assuming he is the right one, which I'm not actually, and putting thoughts down, the story would go something like this ...
Thomas Williams, bn abt 1769 Llanrwst a shoemaker, (though we don't know that the Thomas born 1769 was a shoemaker) (may be son of John and Elizabeth of Llanrwst) marries Emma EVANS (Bn abt 1775 to Edward and Mary Evans, a shoemaker of Rowen, Caerhun), 1812 in Llanddoget, once a spinning woman. But why marry Llanddoget? Emma was noted as being of the parish at the time of marriage so may have gone there for work. Both Thomas and Emma were noted as single, but this would make them 43 and 37 years old respectively, as you say Hugo, unusual. May account for only 2 children though.
They have 2 known children Mary Bp 1814 Caerhun, (Noted as being from Rowen when baptised) who did not marry but had an illegitimate daughter Mary PRITCHARD (who married shoemaker John LLOYD in 1875, at Llanrwst) ...
and John Bp 1817 Caerhun, (noted as being from Rowen in census and baptism records) a gardener and later publican of the Old Telegraph, who married before 1865 to someone unknown. Having been widowed and no sign of surviving offspring, he married Martha ELLIOTT in Daventry in 1865 and took her to Llandudno. (Northampton area being well known for shoes of course but this may be irrelevant).
An awful lot of assumptions and little corroboration for the early part. Somehow don't think we will attain a greater degree of certainty and will always be a vague possibility, but fun figuring it out!
I am awaiting access to the website you mentioned to look for Thomas in the cemeteries
Thanks again ... enjoying the hunt