| Male GILBERT III (Magna Charta Baron) DeCLARE (maid. name 4th Earl of Hertford, 5th Earl of Gloucester) |
| Birth | 1180 | Hertfordshire, England |
| Death | 25 Oct 1230 | Penrose, Brittany, Bretagne, France |
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| Female ISABEL Lady MARSHALL (maid. name Countess of Gloucester) |
| Birth | 1172 | Pembrokeshire, Wales |
| Death | 17 Jan 1240 | Birkhamstead, Hertfords, England |
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| Female + Isabella de Clare (maid. name Lady of Annandale and Gloucester) |
| Birth | 2 Nov 1226 | Tewkesbury, Gloucestershire, , England |
| Death | 10 Jul 1264 | Annandale, Dumfries-shire, Scotland |
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| Spouse | Robert V de Brus (maid. name Sir 5th Lord of Annandale "The Competitor") | F2686 | |
| Marriage | 12 May 1240 | Gloucester, Kent, , England |