Gilbert de Clare, 4th Earl of Hertford

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Gilbert de Clare
4th Earl of Hertford
5th Earl of Gloucester
1st Lord Marcher of Glamorgan
6th Lord Marcher of Cardigan
7th Baron of Clare
Gilbert de Clare.svg.png
Arms of the de Clare Family
Earl of Hereford
Earl of Gloucester

PredecessorRichard de Clare, 3rd Earl of Hertford
SuccessorRichard de Clare, 5th Earl of Hertford
SpouseIsabel Marshal, 7th Countess of Pembroke
FamilyHouse de Clare
FatherRichard de Clare, 3rd Earl of Hertford
MotherAmice Fitz William, 4th Countess of Gloucester
Hertford, Hertfordshire, Kingdom of England
Died25 October 1230
Brittany, Kingdom of France
BuriedTewkesbury Abbey
OccupationPeerage of England

Gilbert de Clare, 4th Earl of Hertford, 5th Earl of Gloucester, 1st Lord of Glamorgan, 7th Baron of Clare (1180-1230) was the son of Richard de Clare, 3rd Earl of Hertford (1153–1217) by his wife Amice Fitz William, 4th Countess of Gloucester (1160-1225), daughter of William Fitz Robert, 2nd Earl of Gloucester (1125-1183) and his wife Hawise de Beaumont (1120-1197). He married Isabel Marshal, 7th Countess of Pembroke (1200-1240), daughter of Sir William Marhsal, Knight by his wife Isabel de Clare, 4th Countess of Pembroke, and had six childen y that marriage. He also inherited from his mother the estates of Gloucester and the honour of St. Hilary, and from Rohese de Giffard, an ancestor, the moiety of the Giffard estates. In June 1202, he was entrusted with the lands of Harfleur and Montrevillers. He never held the Earldom of Pembroke or Marcher Lordship of Striguil Jure Uxoris.


Original Pendant of Gilbert de Clare. The hanger was broken in Battle in the 1220s and never repaired.

In 1215 Gilbert de Clare and his father Richard de Clare were two of the Magna Carta sureties and championed Louis VIII of France in the First Barons' War, fighting at Lincoln, England under the baronial banner. He was taken prisoner in 1217 by William Marshal, whose daughter Isabel Marshal he later married on 9 October, her 17th birthday. In 1223 he accompanied his brother-in-law, William Marshal, 2nd Earl of Pembroke, in an expedition into Wales. In 1225 he was present at the confirmation of the Magna Carta by King Henry III of England. In 1228 he led an army against the Welsh, capturing Morgan Gam, who was released the next year. He then joined in an expedition to Brittany, but died on his way back to Penrose in that duchy. His body was conveyed home by way of Plymouth and Cranborne to Tewkesbury. His widow Isabel later married Richard Plantagenet, Earl of Cornwall & King of the Romans.

Magna Carta

Like his father he sided with the Barons against King John of England. He and his father played a leading part in the negotiations for Magna Carta, being one of the twenty five sureties. There were three House de Clare members at the Magna Carta. Gilber de Clare and his father were among the Barons excommunicated by the Pope in 1215, but by that time no amount of religious anathema could hold by the revolt. The King then layed siege to Tonrbidge Castle. Now outlawed and dispossessed as well as ostracized by the church the de Clare family had their lands seized and given to a royalist soldier of fortune, Robert de Bethune, to manage on the King's behalf. The King died in 1216 and the de Clare family were among the numerous former rebels that flocked to the capital for the autumn council, and there at westminster they were reconciled to the King.


Gilbert de Clare married once to Isabel Marshal, 7th Countess of Pembroke, daughter of Sir William Marshal, Knight and Isabel de Clare, 4th Countess of Pembroke (1172–1220), and had six children by that marriage:


  • Hall, H. (1913). The Marshal Pedigree. The Journal of the Royal Society of Antiquaries of Ireland, 3(1), 1-29.
  • Hollister, C. W. (1973). The strange death of William Rufus. Speculum, 48(4), 637-653.
  • Malden, H. E. (1924). Devereux Papers with Richard Broughton's Memoranda (1575–1601). Camden Third Series, 34, 1-36.
  • Ward, J. C. (1981). Fashions in monastic endowment: the foundations of the Clare family, 1066–1314. The Journal of Ecclesiastical History, 32(4), 427-451.