From the WeRelate page on her husband's father, Nathaniel Davis:

http://www.werelate.org/wiki/Person:Nathaniel_Davis_(7)

One tradition has it that about 1680 Nathaniel Davis, a native of Wales, married a child of Nicketti, a daughter of Opechancahough, the brother of Powhatan. Their son Robert Davis was an ancester of Jefferson Davis, President of the CSA.

According to another record, Martha Davis, who married Abraham Venable II, was a daugher of Nathaniel Davis. Elizabeth Marshall Venable says, "Hugh Lewis came first with this wife and daughter, Abediah Lewis, and lost his wife in America and returned to Britain with Abediah, his only daughter, and both returned again to America in Virginia, with Robert Davis, who came away without the consent of his parents, and served four years in Virginia, King & Queen County, for his passage, and then married Abediah Lewis, with whom he emigrated. The descendants who prefer for their heritage the romance of the Indian Princess, Nikitti, will find preferable the account in 'Cabells and their Kin' We believe that of our own family record is more nearly correct."

RIN: MH:I634

References

• Jackson Sterett Moorman. Ancestors of Mary Burr Moorman (Harpole), et al. (Louisville, KY, Nov. 15, 1945), p. 5, 30 Jul 2006, Primary quality.