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About Isabel de Clare, 4th Countess of Pembroke
a possible death date from merges was 7 October 1220

the current listed death date comes from

http://www.castlewales.com/marshals_ireland.pdf

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"Isabel de Clare, suo jure Countess of Pembroke and Striguil , was a Cambro-Norman-Irish noblewoman and one of the wealthiest heiresses in Wales and Ireland. She was the wife of William Marshal, 1st Earl of Pembroke, who served four successive kings as Lord Marshal of England. Her marriage had been arranged by King Richard I."

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Links:

http://en.wikipedia.org/wiki/Isabel_de_Clare,_4th_Countess_of_Pembroke

http://www.findagrave.com/cgi-bin/fg.cgi?page=gr&GRid=32004131

http://histfam.familysearch.org/getperson.php?pers...EuropeRoyalNobleHous

http://histfam.familysearch.org/getperson.php?personID=I2406&tree=Nixon

http://histfam.familysearch.org/getperson.php?personID=I122006&tree=Welsh

http://www.thepeerage.com/p10292.htm#i102913

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Citations / Sources:

[S11] Alison Weir, Britain's Royal Family: A Complete Genealogy , page 68. Hereinafter cited as Britain's Royal Family.

[S2] Peter W. Hammond, editor, The Complete Peerage or a History of the House of Lords and All its Members From the Earliest Times, Volume XIV: Addenda & Corrigenda , page 6. Hereinafter cited as The Complete Peerage, Volume XIV.

[S37] Charles Mosley, editor, Burke's Peerage, Baronetage & Knightage, 107th edition, 3 volumes Ltd, 2003), volume 1, page 682. Hereinafter cited as Burke's Peerage and Baronetage, 107th edition.

[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 , volume X, page 364. Hereinafter cited as The Complete Peerage.

[S452] #21 The Complete Peerage of England, Scotland, Ireland, Great Britain and the United Kingdom, Extant, Extinct, or Dormant , Cokayne, George Edward and Vicary Gibbs , , vol. 3 p. 431; vol. 4 p. 197; vol. 4 appndx. H chart III; vol. 14 p. 6 [ABERGAVENNY].

[S266] #379 [7th edition, 1992] Ancestral Roots of Certain American Colonists, Who Came to America Before 1700 , Weis, Frederick Lewis, , FHL book 974 D2w 1992., p. 69 line 66:27.

[S673] #1079 A History of Monmouthshire from the Coming of the Normans into Wales down to the Present Time , Bradney, Sir Joseph Alfred, , FHL book 942.43 H2b., vol. 4 p. 4, 5*.

[S271] Stokvis, Stokvis, A. M. H. J., , FHL 929.7 St67m., vol. 2 p. 271*.

[S2434] #2105 Heraldic Visitations of Wales and Part of the Marches Between the Years 1586 and 1613 by Lewys Dwnn , Dwnn, Lewys; transcribed and edited with notes by Sir Samuel Rush Meyrick, , FHL book 942.9 D23d; FHL microfilm 176,668., vol. 2 p. 55.

[S2411] #11915 British Genealogy , Evans, Alcwyn Caryni, , FHL microfilms 104,355 and 104,390 item 2., book 5 p. E69.

[S138] MS. 6614E - Davies of Cringell , , FHL microfilm 104381 item 8., no page numbers.

[S2416] #12627 Genealogy of Shropshire [by Joseph Morris] , Morris, Joseph, , vol. 1-2 FHL microfilm 504,551; vol.3-4 FHL microf., vol. 6 p. 2943.

[S673] #1079 A History of Monmouthshire from the Coming of the Normans into Wales down to the Present Time , Bradney, Sir Joseph Alfred, , FHL book 942.43 H2b., vol. 2 p. 259.

[S271] Stokvis, Stokvis, A. M. H. J., , FHL 929.7 St67m., vol. 2 p. 271.

http://en.wikipedia.org/wiki/Isabel_de_Clare,_4th_Countess_of_Pembroke

http://www.wikitree.com/wiki/Clare-22

http://en.wikipedia.org/wiki/Isabel_de_Clare,_3rd_Countess_of_Pembroke

Isabel de Clare, Countess of Pembroke and Striguil, suo jure was a Cambro-Norman-Irish noblewoman and one of the greatest heiresses in Wales and Ireland. She was the wife of William Marshall, 1st Earl of Pembroke

Isabel was born in 1172, the eldest child of Richard de Clare, 2nd Earl of Pembroke (1130 – 20 April 1176, known in history as Strongbow and Aoife of Leinster, the daughter of Dermot MacMurrough, King of Leinster and More O'Toole. The latter was a daughter of Muitchertach O'Toole and Cacht Inion Loigsig O'Morda. The marriage of Strongbow and Aoife took place in August 1170, the day after the capture of Waterford by the Cambro-Norman forces led by Strongbow, and abetted by Dermot MacMurrough.
Isabel's paternal grandparents were Gilbert de Clare, 1st Earl of Pembroke and Isabella de Meulan. She had a younger brother Gilbert de Striguil, 3rd Earl of Pembroke, who died at the age of 12. She also had an illegitimate half-sister Basile de Clare, who married three times. Basile's husbands were: Robert de Quincy; Raymond Fitzgerald, Constable of Leinster: Geoffrey FitzRobert, Baron of Kells.
Isabel was described as pleasant, gentle, and extremely attractive. After her brother Gilbert's death in 1185, she became one of the wealthiest heiresses in the kingdom, owning besides the titles of Pembroke and Striguil,suo jure, much land in Wales and Ireland. She inherited the numerous castles on the inlet of Milford Haven, guarding the South Channel, including Pembroke Castle.[1] She was a ward of King Henry II.