World of HYDE
Discovering our Ancestors and their descendants to all parts of the world. Last updated 15th March 2026.
Family: Gilbert De Clare, 5th Earl Of Gloucester / Isabel Marshal, Countess Of Hertford (F15331)
m. 9 Oct 1223
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Male
Gilbert De Clare, 5th Earl Of Gloucester
Birth 1180 Hertford, Hertfordshire, England 
Death 25 Oct 1230 Penros, Brittany, France Burial 10 Nov 1230 Tonbridge Priory, Tonbridge, Kent, England Marriage 9 Oct 1223 Father Richard De Clare, 3rd Earl Of Hertford | F15768 Group Sheet Mother Amice Fitzwilliam, 4th Countess Of Gloucester | F15768 Group Sheet
Female
Isabel Marshal, Countess Of Hertford
Birth 9 Oct 1200 Pembroke Castle, Pembrokeshire, Wales Christening Apr 1206 Saint David's, Pembrokeshire, Wales Death 17 Jan 1240 Berkhamstead Castle, Herfordshire, England Burial 1240 Beaulieu Abbey, Brockenhurst, Hampshire, England Other Spouse Richard Plantagenet, 1st Earl Of Cornwall | F27918 Marriage 30 Mar 1231 Fawley, Buckinghamshire, England Father Sir William Marshall, 1st Earl Of Pembroke | F15310 Group Sheet Mother Isabel De Clare, 4th Countess Of Pembroke | F15310 Group Sheet
Female
Amice De Clare, Countess Of Devon
Birth 27 May 1220 Plumpton, Yorkshire, England Death Bef 21 Jan 1284 Plumpton, Yorkshire, England Burial Spouse Baldwin De Reviers, 6th Earl Of Devon | F15781 Marriage Oct 1235 Tewkesbury, Gloucestershire, England, United Kingdom Spouse Nigel De Plumpton | F15782 Marriage 1238 York, England
Female
Isobell De Clare, Of Gloucester And Hartford
Birth 2 Nov 1226 Tewkesbury, Gloucestershire, England Christening 15 Nov 1226 Kildrummy Castle, Aberdeenshire, Scotland Death 10 Jul 1264 Cleveland, Yorkshire, England Burial Guisborough, Redcar and Cleveland Unitary Authority, North Yorkshire, England Spouse Robert De Brus, 5th Lord Annandale | F65896 Marriage 12 May 1240 Annandale, Dumfriesshire, Scotland
Male
Richard De Clare, 5th Earl Of Hereford 6th Earl Of Gloucester
Birth 4 Aug 1222 Clare Castle, Clare, Suffolk, England Death 14 Jul 1262 Waltham, Canterbury, England Burial 29 Jul 1262 Tewkesbury, Gloucestershire, England, United Kingdom Spouse Lady Maud De Lacy, Countess Of Hertford And Gloucester | F9658 Marriage 25 Jan 1238
Male
William De Clare
Birth 18 May 1228 Gloucestershire, England, United Kingdom Death 23 Jul 1258 Berwickshire, Scotland Burial 23 Jul 1258 Hastings, Sussex, England Spouse Margery De Burgh | F27843 Marriage Wem, Shropshire, England
Female
Agnes De Clare
Birth 1229 Gloucestershire, England, United Kingdom Death 26 Dec 1261 England, Unitd Kingdom Burial Spouse Dugal | F15785 Marriage
Male
Gilbert De Clare
Birth 13 Sep 1229 Gloucestershire, England, United Kingdom Death Aft 1241 Gloucestershire, England, United Kingdom Burial