article_snippet.sent: US genealogy expert Megan Smolenyak  is named after Dyfodwg, or Tyfodwg, a sixth century Welsh saint who some believe may have been a Breton Monk.
article_snippet.sent: Megan Smolenyak  said: 'Born around 1850 in Merthyr Tydfil – at that time, the largest town in Wales –
article_snippet.sent: [Mary Griffiths] can be found in the 1851 census living with Megan Smolenyak  widowed mother and three older siblings. '
article_snippet.sent: 1850s - Mary Griffiths born in Merthyr Tydfil in Wales to poor family.
article_snippet.sent: 1850s - Mary Griffiths born in Merthyr Tydfil in Wales to poor family was living with 1850s - Mary Griffiths born in Merthyr Tydfil in Wales to poor family widowed mother and three siblings in Wales and by the age of 12 was working as a slave.
article_snippet.sent: 1850s - Mary Griffiths born in Merthyr Tydfil in Wales to poor family married William Jones, a coal miner from Neath near Swansea.
article_snippet.sent: William Jones, a coal miner from Neath near Swansea settled in Ystradyfodwg, near Merthyr Tydfil.