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Marriage:
Bibliography
  1. Cokayne, George Edward, Complete Peerage of England, Scotland, Ireland, Great Britain, and the United Kingdom, extant, extinct, or dormant, vol 12-2, Tracton-Zz. London: St Catherine Press, 1959. Reprinted (4 per page) Gloucester: A Sutton, 1982. Available at https://familysearch.org/search/catalog/271412 Information from this source tagged as [Ref: CP XII/2 [Ap][p0-9].*].

Sources with Information about marriage to Joan ROSCELYN
date:
before 24 Jun 1351 [Ref: CP XII/2 p659]
Research Notes:



Pedigree of William De SYNYTHWAYT
William De SYNYTHWAYT



Descendants of William De SYNYTHWAYT
1. William De SYNYTHWAYT m. Joan ROSCELYN
m. Joan ROSCELYN father: Peter ROSCELYN mother: Mabel