Isabel Marshal
- Marriage: Sir Gilbert de Clare Earl of Clare, Hertford and Gloucester on 9 Oct 1217
- Died: 17 Jan 1239 or 1240, Berkhampstead, England
 Research Notes:
Source: Ancestral Roots of Certain American Colonists Who Came to America before 1700 by Frederick Lewis Weis and Walter Lee Sheppard, Jr, ed. by William R. Beall & Kaleen E. Beall (Baltimore, 2008), line 63-29 (Sir Gilbert de Clare)
Isabel married Sir Gilbert de Clare Earl of Clare, Hertford and Gloucester, son of Richard de Clare 6th Earl of Clare, Hertford and Gloucester and Amice Countess of Gloucester, on 9 Oct 1217. (Sir Gilbert de Clare Earl of Clare, Hertford and Gloucester was born about 1180 and died on 25 Oct 1230 in Penros, Brittany, France.)
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