Royal Ancestry by Douglas Richardson Vol. IV page 351
Brydges, E. (1812). "Percy, Duke of Northumberland." Collins's Peerage of England Genealogical, Biographical, and Historical, (Vol. II, pp.217-366). London: F.C. and J. Rivington, Otridge and Son. Print. (see eBook at archive.org)
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Given the earlier comments about conflation of Williams d’Aton, can we confirm we have the correct death date, and implicitly identity and connected family? Wikipedia has an earlier death date. Unable to see Richardson’s precis or sources, I’m unable to resolve this to my satisfaction. Anyone have the actual primary source evidence at hand?
His mother is unknown. Margaret de Vesci was his great-grandmother.
William Aton m Isabel Percy
The William Aton-10 who married Isabel de Vere is the grandson of Gilbert Aton and Margaret Vesci.
He is NOT the brother of William Aton-16 who married Isabel Percy. William Aton-16 is the grandson of William Aton and Isabel de Vere.
These profiles need sorting, and Marlyn Lewis has the accurate lineage, sourced.