Not much is known of Mary Pierce. This is not uncommon for women of this time period.
Some confusion as to the spelling of her last name. Second spelling I've seen is Pearce. I can find no mention of her parents.
I've put her death date as before William's as he does not mention her in his will. A copy of which can be found in this book:
Campbell Kith and Kin: Descendants of Archibald Campbell and Elizabeth Baker, who Came from Campbell County, Virginia, to Knox County, Tennessee, 1796. Page 45.
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Featured National Park champion connections: Mary is 16 degrees from Theodore Roosevelt, 22 degrees from Stephanus Johannes Paulus Kruger, 14 degrees from George Catlin, 14 degrees from Marjory Douglas, 18 degrees from Sueko Embrey, 16 degrees from George Grinnell, 24 degrees from Anton Kröller, 17 degrees from Stephen Mather, 23 degrees from Kara McKean, 12 degrees from John Muir, 16 degrees from Victoria Hanover and 23 degrees from Charles Young on our single family tree. Login to find your connection.