"Margaret de Clare, Countess of Cornwall, Countess of Gloucester (October 1293 – April 1342), was an English noblewoman, heiress, and the second eldest of the three daughters of Gilbert de Clare, 6th Earl of Hertford and his wife, Joan of Acre, making her a granddaughter of King Edward I of England. Her two husbands were Piers Gaveston and Hugh de Audley, 1st Earl of Gloucester."

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Links:

http://en.wikipedia.org/wiki/Margaret_de_Clare

http://www.findagrave.com/cgi-bin/fg.cgi?page=gr&GRid=86204203

http://histfam.familysearch.org/getperson.php?personID=I640&tree=Nixon

http://histfam.familysearch.org/getperson.php?personID=I784&tree=PagetHeraldicBaronag

http://histfam.familysearch.org/getperson.php?personID=I216942&tree=Welsh

http://www.mathematical.com/claremargaret1292.html

http://www.thepeerage.com/p10485.htm

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Citations / Sources:

[S2] Paget Heraldic Baronage, Paget, Gerald, (Manuscript, filmed by the Genealogical Society of Utah, 1957), chart no. 17 Audley, Earl of Gloucester, chart no. 29 Basset of Drayton, FHL microfilm 170063, chart no. 130 Clare, FHL microfilm 170063, 2/2.

[S106] Royal Genealogies Website (ROYAL92.GED), online ftp://ftp.cac.psu.edu/genealogy/public_html/royal/index.html. Hereinafter cited as Royal Genealogies Website.

[S11] Alison Weir, Britain's Royal Family: A Complete Genealogy (London, U.K.: The Bodley Head, 1999), page 83. Hereinafter cited as Britain's Royal Family.

[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 I, page 346. Hereinafter cited as The Complete Peerage.

[S4587] The Magna Charta Sureties, 1215 (1964), Adams, Arthur and Weis, Frederick Lewis, (Reprint of the second authorized edition with revision and corrects by Walter Lee Shepard, Jr. published in Baltimore in 1964. The original was first published in Boston in 1955. Microfilm of original published: Baltimore [Mayland]: Genealogical Publishing Company, 1968. Salt Lake city, Utah: Filmed by the Genealogical Society of Utah, 1978), FHL book 973 D2aa, volumes 1-5; FHL microfilm1,036., p. 36 line 28:5.

[S2420] #11886 The Golden Grove books of pedigrees (filmed 1970), (Manuscript, National Library of Wales manuscript number Castell Gorfod 7. Filmed by the Genealogical Society of Utah, 1950), FHL microfilms 104,349-104,351., book 5 p. C624*.

[S673] #1079 A History of Monmouthshire from the Coming of the Normans into Wales down to the Present Time (1904-1993), Bradney, Sir Joseph Alfred, (Publications of the South Wales Record Society, number 8. Five volumes in 13. London: Mitchell, Hughes and Clarke, 1904-1993), FHL book 942.43 H2b., vol. 3 p. 8*.

[S2511] Plantagenet Ancestry of Seventeenth-century Colonists: the Descent from the Later Plantagenet Kings of England, Henry III, Edward I, Edward II, and Edward III, of Emigrants from England and Wales to the North American Colonies Before 1701 (2nd ed., 1999), Faris, David, (2nd edition. Boston: New England Historic Genealogical Society, 1999), FHL book 973 D2fp., p. 299 RANDOLPH:11.