Shaw, R. L. J. "Holland [married name Beaufort], Margaret, duchess of Clarence (...

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Shaw, R. L. J. "Holland [married name Beaufort], Margaret, duchess of Clarence (b. in or before 1388, d. 1439), wealthy widow and monastic patron" in Oxford Dictionary of National Biography. May 21, 2009. Oxford University Press. Accessed 25 Nov 2019 (w/subsc.) at OxfordDNB.com.

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