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- [S22] The Complete Peerage, G. E. Cokayne, with Vicary Gibbs, H.A. Doubleday, Geoffrey H. White, Duncan Warrand and Lord Howard de Walden (eds.), (Alan Sutton Publishing, 1910–59; reprint in 6 volumes, Gloucester, 2000), volume XII/2, page 547.
- [S22] The Complete Peerage, G. E. Cokayne, with Vicary Gibbs, H.A. Doubleday, Geoffrey H. White, Duncan Warrand and Lord Howard de Walden (eds.), (Alan Sutton Publishing, 1910–59; reprint in 6 volumes, Gloucester, 2000), volume XII/2, page 547.
Citing Genealogist, N.S., volume iii, page 109; Swallow, De Nova Villa (1885), pages 137, 297; 44th Rep., D.K. Pub. Rec., App. pages 525–27 (Inq. p. m.).
- [S8] BP 1970, Peter Townend (ed.), (London: Burke's Peerage Ltd., 1970), page liii.
- [S9] Oxford D.N.B., H. C. G. Matthew (ed.), (Oxford: Oxford University Press, 2004), Simon Walker, "Katherine [née Katherine Roelt; married name Katherine Swynford], duchess of Lancaster (1350?–1403), mistress and third wife of John of Gaunt, duke of Lancaster".
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