Dear Newsgroup ~
Complete Peerage 2 (1912) 63 (sub Beaumont) indicates that William Beaumont, 2nd Viscount Beaumont [died 1507] married (1st) "before 4 March 1461, Joan, daughter of Humphrey (Stafford), 1st Duke of Buckingham, by Ann, daughter of Ralph (Nevill), 1st Earl of Westmorland." END OF QUOTE.
Complete Peerage further states that "this marriage was, however, set aside before 1477."
In footnote d on page 63, it is noted that Joan Stafford "married, about that date (as the 2nd of his three wives), Sir William Knyvett, of Buckenham, Norfolk, and was living temp. Richard III."
As to exactly when Joan Stafford and William Beaumont were divorced, it is well documented that William Beaumont was attainted in 1461. On 5 March 1462 the king granted his wife, Joan, and the heirs of her body various of Beaumont family manors, including Watton-at-Stone, Hertfordshire, Cantley, Erpingham, Fareswell, Roughton, Stow Bardolph, and Whinbergh, Norfolk, Bendish, Clopton, Cretingham, Dennington, and Ilketshall, Suffolk, Ruskington, Lincolnshire, etc. [see C.P.R. 1461–1467 (1897): 179–180, 355–356]. In 1465 William, Viscount Beaumont, Dame Joan Beaumont (not then styled his wife), and two others, feoffees, presented to the church of Stapleford, Hertfordshire [see Clutterbuck, Hist. & Antiqs. of Hertford 2 (1821): 219]. In 1475 the feoffees of “Joan Beaumont, daughter of Humphrey Duke of Buckingham” presented to the church of North Runcton, Norfolk [see Stapleton, De Antiquis Legibus Liber: Cronica Maiorum et Vicecomitum Londoniarum (Camden Soc. 34) (1846): ccxv]. Thus, it would appear William Beaumont and Joan Stafford were still married as late as 1462. They were probably divorced by 1465, and certainly by 1475.
As to when Joan Stafford married her 2nd husband, Sir William Knyvet, I find that in 16 Edward IV [1476–77] William Knyvett and his wife Joan held court for the manors of Wymondham and Wymondham Gryshaugh, Norfolk [see Rpt. on the MSS of the Marquess of Lothian (Hist. MSS Comm.) (1905): 63]. William and Joan his wife presented to the church of Cantley, Norfolk in 1477 [see Blomefield, Essay towards a Top. Hist. of Norfolk 4 (1775): 17; Stapleton, De Antiquis Legibus Liber: Cronica Maiorum et Vicecomitum Londoniarum (Camden Soc. 34) (1846): ccxv].
In spite of Joan Stafford's divorce from William Beaumont, it appears that she continued to be known as Lady Beaumont following her divorce and remarriage to Sir Wiliam Knyvet. She is called "my sister Beaumont" in the 1472 will of her sister, Anne Vere, Lady Cobham [see Nicolas, Testamenta Vetusta 1 (1826): 325]. She is called "my daughter Beaumond" in the undated will of her mother, Anne, Duchess of Buckingham, proved in 1480 [see Nicolas, Testamenta Vetusta 1 (1826): 356–357]. In Easter term 1485 John Carter the elder and others sued William Knyvet, Knt., of Buckenham Castle, Norfolk, and Joan, Lady Beaumont, his wife in the Court of Common Pleas regarding a trespass [vi et armis] at Norwich, Norfolk [see Court of Common Pleas, CP40/892, image 406f (available at
http://aalt.law.uh.edu/AALT3/R3/CP40no892/aCP40no892fronts/IMG_0406.htm); Court of Common Pleas, CP40/892, image 1139d (available at http://
aalt.law.uh.edu/AALT3/R3/CP40no892/bCP40no892dorses/IMG_1139.htm)].
As to the death date of Joan Stafford, Lady Beaumont, it appears that she was living as late as Easter term 1485 (date of lawsuit cited above). She died later in the year 1485 [see, for example, Strachey, Rotuli Parliamentorum 6 (1777): 298 (Parliamentary petition of William Knyvet, Knt. dated 1485 mentions “Jane late his Wyfe”)]. In 1486 William sued his wife, Joan’s former husband, William Beaumont, Lord Beaumont, in Chancery regarding the manors of Fareswell, Stow Bardolph, and Whinbergh, Norfolk, and Bendish, Cretingham, Dennington, and Ilketshall, Suffolk [see National Archives, C 1/81/10 (available at http://
discovery.nationalarchives.gov.uk).
In summary, we see that Joan Stafford and her 1st husband, William Beaumont, 2nd Viscount Beaumont, were still married in 1462. He and Joan were divorced possibly as early as 1465, and probably before 1475. Joan married (2nd) before 1476–77 Sir William Knyvet, of Buckenham, Norfolk. They had three sons, Edward, Knt., Charles, and John, and two daughters, Elizabeth and Anne (wife of Charles Clifford, Esq.). Joan was living in Easter term 1485 (date of lawsuit), but was dead later in that year (date of her 2nd husband's petition to Parliament).
Best always, Douglas Richardson, Salt Lake City, Utah