Her husband remarried before 1244[2], so she must have died before then. She was buried in Alnwick Abbey.[2]
Sources
↑Oxford Oxford Dictionary of National Biography: 'Longespée [Lungespée], William, third earl of Salisbury', 2004, revised online 2010, available online thorough some libraries
↑ 2.02.12.22.3 G E Cokayne. Complete Peerage, new edition, Vol. 12B, St Catherine Press, 1959, pp. 277-278
Richardson, Douglas. Royal Ancestry: A Study in Colonial and Medieval Families, 5 vols, ed. Kimball G. Everingham. Salt Lake City: the author, 2013. See also WikiTree's source page for Royal Ancestry:
Vol. III. page 608
Vol. IV. page 590
Cokayne, G E. Complete Peerage, new edition, Vol. 12B, St Catherine Press, 1959
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Is there any source for the birthplace of Salisbury? The fact that her mother was Countess of Salisbury does not mean Isabel was born there: her parents had extensive landholdings in a number of counties. Neither Medlands nor Cokayne give a birth place.