The Victorian judge and MP Watkin Williams claimed that his family had been the occupiers of Pen-y-Graig and that they had been amongst the first religious non-conformists in the area.
Roedd Watkin Williams, barnwr o gyfnod Victoria ac Aelod Seneddol, yn honni fod Pen-y-Graig wedi bod ym meddiant ei deulu af, ac iddynt fod ymhlith yr anghydffurfwyr cyntaf yn yr ardal.