Wikipedia: William Montagu, Earl of Salisbury, citing Ormrod, W.M. (1990). The R...

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Wikipedia: William Montagu, Earl of Salisbury, citing Ormrod, W.M. (1990). The Reign of Edward III. New Haven and London: Yale University Press. p. 24. ISBN 0-300-04876-9. See also Catherine's Wikipedia article.

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