Yn diddori edau ( ai ond at agor 'm chreuau am 'r anwybod chan rhyw chan 'n chyd-swyddogion acha 'ma ) Fi m 'n bert 'n ddiball a ni i mewn Cymru ca erioed had a unoledig heavyweight champ. fel fi m yn cerdded at chyd-a 'r 'n gynt ateb chan 'n Greigiog Marciano ( bu statiuoned i mewn gwrymiau achos rhyw amsera fel Mai wedi crapio hychydig eiriau bai yn cilgwthio 'i at ddeud a bu 'n sylweddol Cymraeg areithiwr er ) Ynte , Adwaen areithian choelbren chan Cymraeg i mewn Patagonis Argentina. Fel atfydd hun chan 'r champs bwriedig rhyw amsera 'na ai 'n briod an Argentine.

I'll attempt to translate from my somewhat pidgin Welsh:

Interesting thread (if only to open my eyes at the ignorance of some of our colleagues on here )

I'm pretty sure that we in Wales have never had a unified heavyweight champ ...... so I'm going to go with the earlier answer of Rocky Marciano (he was statiuoned in wales for some time so may have picked up a few words - it would be pushing it to say that he was really a welsh speaker though)

Otherwise, I know they speak a lot of Welsh in Patagonis, Argentina. So perhaps one of the champs spent some time there or married an Argentine?