It's all explained on the first paragraph of her profile:
Mary Jones was born in 1644 in Welshpool (Y Trallwng), Montgomeryshire, Wales. According to Burke's "Landed Gentry of England," she was the daughter of Colonel Roger Jones, Governor of Dublin in the reign of James II, who defeated the Marquis of Ormond in 1649. However, in the "Collection of Memorials" she is said to have been the daughter of Gilbert Jones, of Welshpool, Wales. A problem arises from the fact that the Colonel Jones who routed the Marquis of Ormond at Rathmines, near Dublin in 1649 had the Christian name, according to both Leland and Plowden, of Michael, not Gilbert or Roger. More importantly, Colonel Michael Jones' family had emigrated from Wales to Ireland in the 16th Century; they were from Merionthshire, not Montgomeryshire, where Welshpool, widely-acknowledged as Mary Jone's birthplace, is located.
