Primary Sources

Inquisitions Post Mortem for Margaret late the wife of Robert de Ufford, Earl of Suffolk, Writ, 4 April, 42 Edward III [1368].

"Thomas Kayly, knight, sometime her husband"

She died without heirs of the bodies of herself and the said Thomas on Palm Sunday last [2 Apr 1368]. John son of Constantine de Clefton, knight, son of Adam son of Margery, aunt of the said Thomas, aged 15 years and more, is kinsman and heir of Thomas.

Notes

Wikipedia.org records 8 children by Robert d'Ufford, 1st Earl of Suffolk

• Robert Ufford, who predeceased his father without issue.
• William de Ufford, 2nd Earl of Suffolk
• Walter Ufford, third son
• Joan Ufford, eldest daughter
• Catharine Ufford
• Cecily Ufford
• Margaret Ufford
• Maud Ufford

Other Sources

1.[S6] G.E. Cokayne; with Vicary Gibbs, H.A. Doubleday, Geoffrey H. White, Duncan Warrand and Lord Howard de Walden, editors, The Complete Peerage of England, Scotland, Ireland, Great Britain and the United Kingdom, Extant, Extinct or Dormant, new ed., 13 volumes in 14 (1910-1959; reprint in 6 volumes, Gloucester, U.K.: Alan Sutton Publishing, 2000), volume II, page 470. Hereinafter cited as The Complete Peerage.