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Bibliography
  1. Cokayne, George Edward, Complete Peerage of England, Scotland, Ireland, Great Britain, and the United Kingdom, extant, extinct, or dormant, vol 08, Lindley-Moate. London: St Catherine Press, 1932. Reprinted (4 per page) Gloucester: A Sutton, 1982. Available at https://familysearch.org/search/catalog/271412 Information from this source tagged as [Ref: CP VIII [Ap][p0-9].*].
  2. Sanders, I. J., English Baronies, A Study of Their Origin and Descent 1086-1327. Oxford: Clarendon Press, 1960. Information from this source tagged as [Ref: Sanders Baronies p[0-9]*].

Sources with Information about marriage to Joan MARMION
names:
[Ref: CP VIII p507, CP VIII p512(i), CP VIII p513, Sanders Baronies p145]
Research Notes:



Pedigree of William De MORTEYN
William De MORTEYN



Descendants of William De MORTEYN
1. William De MORTEYN m. Joan MARMION
m. Joan MARMION father: Philip MARMION, Baron Of Tamworth mother: Joan De KILPEK