Mary was the husband of Samuel Davies. Her name is given in censuses from 1851 through 1891. In the 1861 and 1871 censuses, she and her husband lived with her parents, John and Sarah Griffiths at 31 Broad Street in Dowlais.
For more detailed information about her and her family, see her husband's entry.
https://www.ancestryinstitution.com/family-tree/person/tree/18925669/person/733883428/facts
All census records (including images) are accessible via the Ancestry entry.
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