Beaufort, Margaret, Countess of Richmond and Derby, 1443-1509 (Personal Name)
- Derby, Margaret Beaufort, Countess of Richmond and, 1443-1509
- Margaret, Lady, 1443-1509
- Richmond and Derby, Margaret Beaufort, Countess of, 1443-1509
- Earlier heading: Richmond, Margaret Beaufort Tudor, Countess of, 1441-1509
Simon, L. Of virtue rare, c1982 (subj.) t.p. (Margaret Beaufort) CIP galley (b. 5/31/1441, d. 1509)
Cokayne, G. E. Complete peerage, 1945, v. 10, p. 827 (Richmond, Margaret Beaufort, b. 5/31/1443, d. 1509; Countess of Richmond and Derby)
Encyc. brit., 1972 (Beaufort, Margaret, 1443-1509; m. to Edmund Tudor, Earl of Richmond; later m. Thomas Lord Stanley, afterward Earl of Derby)
Cooper, C. H. Memoir of Margaret, Countess of Richmond and Derby, 1874: t.p. (Margaret, Countess of Richmond and Derby)
Routh, E. M. G. Lady Margaret, a memoir of Lady Margaret Beaufort, Countess of Richmond & Derby, mother of Henry VII, 1924: t.p. (Lady Margaret Beaufort, Countess of Richmond and Derby) p. 12 (b. 5/31/1441)
Info. from Cambridge Univ. Press, 11-14-91 (correct d.o.b. for Lady Margaret Beaufort is 1443)