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I am also a descendant of William C. Pyron who married Mary Powell. I can only list nine children: Mahala; Sarah, 1773; Mary, abt. 1775; James, May 25, 1776; Thomas P. abt. 1778; Emilia, abt. 1780; William, bet. 1790-1794; Jane, July 6, 1798; and Drewry, August 17, 1799. William, b. bet. 1790-94 apparently married Nancy Crowell, b. bet. 1784-1794.
May I ask what proof you have found that James is the father of William C. Pyron? Also that this James was the son of a James? Do you have any locations on the two James, aside from the James City, VA address? We seem to have much the same info as you but have not been able to prove the descent from the James Pyrons that you mention.
Would appreciate your input. Thank you. Anne