Isabel Marshal, Countess of Cornwall

"Isabel Marshal (9 October 1200 – 17 January 1240) was a medieval English countess. She was the wife of both Gilbert de Clare, 4th Earl of Hertford and 1st Earl of Gloucester and Richard, 1st Earl of Cornwall (son of King John of England). With the former, she was a great grandparent of King Robert the Bruce of Scotland."

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Links:

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

http://www.findagrave.com/cgi-bin/fg.cgi?page=gr&GRid=89565702

http://www.geneall.net/U/per_page.php?id=9463

http://histfam.familysearch.org/getperson.php?personID=I1327&tree=E...

http://histfam.familysearch.org/getperson.php?personID=I2405&tree=N...

http://histfam.familysearch.org/getperson.php?personID=I216913&tree...

http://www.thepeerage.com/p10125.htm

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Citations / Sources:

[S11] Alison Weir, Britain's Royal Family: A Complete Genealogy (London, U.K.: The Bodley Head, 1999), page 68.

[S23] Magna Carta Ancestry: A study in Colonial and Medieval Families, Richardson, Douglas, (Kimball G. Everingham, editor. 2nd edition, 2011), vol. 1 p. 451.

[S26] #374 The Lineage and Ancestry of H. R. H. Prince Charles, Prince of Wales (1977), Paget, Gerald, (2 volumes. Baltimore: Geneal. Pub., 1977), FHL book Q 942 D22pg., vol. 1 p. 15-16.

[S27] #849 Burke's Guide to the Royal Family (1973), (London: Burke's Peerage, c1973), FHl book 942 D22bgr., p. 195.

[S29] #798 The Wallop Family and Their Ancestry, Watney, Vernon James, (4 volumes. Oxford: John Johnson, 1928), FHL book Q 929.242 W159w; FHL microfilm 1696491 items 6-9., vol. 1 p. 203, vol. 2 p. 530.

[S31] #21 The complete Peerage of England, Scotland, Ireland, Great Britain, and the United Kingdom, extant, extinct, or dormant, Cokayne, George Edward, (Gloucester [England] : Alan Sutton Pub. Ltd., 1987), 942 D22cok., vol. 2 p. 359;