Isabella Marshal 
Isabella was born on October 9th, 1200 in Pembroke Castle, Wales. Isabella's father was Sir William Marshal Earl of Pembroke and her mother was Isabel de Clare Cts de Strigoil. She had five brothers and five sisters, named William Marshal II, Gilbert Marshal, Richard Marshal, Walter Marshal, Anselm Marshal, Margaret, Maud, Johanna (Joan), Sibilla and Eva. She was the fifth youngest of the eleven children. She died in Berkhamsted Castle, Hertfordshire, England.Death Notes
Jaundice contracted whilst in childbed.
General Notes
Isabel m. 1st to Gilbert de Clare, Earl of Gloucester; and 2ndly, to Richard, Earl of Cornwall. This lady had, as her portion, Kilkenny. [Sir Bernard Burke, Dormant, Abeyant, Forfeited, and Extinct Peerages, Burke's Peerage, Ltd., London, 1883, p. 358, Marshal, Earls of Pembroke]
Isabella and Gilbert de Clare were married in a religious ceremony on October 9th, 1217 in Tewkesbury Abbey, Gloucester. They had three sons and three daughters, named Richard de Clare, William, Gilbert, Amicia, Isabel and Agnes.
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Children
Death Notes
Possibly poisoned by Peter de Savoy, a friend of Simon de Montfort.Death Notes
Food poisoning.
Amicia de Clare
Amicia was born on May 27th, 1220. She died at the age of 64 on November 30th, 1284.
Richard de Clare Earl of Gloucester & Hertford
Richard de Clare was born on August 4th, 1222 in Mellent, Gloucester, England. He died at the age of 39 on July 15th, 1262 in Ashenfield, Canterbury, Kent.
Isabel de Clare
Isabel was born on November 2nd, 1226 in of Gloucestershire, England. She died after July 10th, 1264.
William de Clare
William was born on May 18th, 1228. He died at the age of 30 in July 1258.
Isabella and Richard of Cornwall were married in a religious ceremony in Fawley Church, Buckinghamshire. They had four sons and a daughter, named Henry, Richard, Nicholas, John and Isabella.
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Children
Death Notes
Murdered by the sons of Simon de Montfort.
Isabella Plantagenet
Isabella was born on September 9th, 1233 in Marlowe-on-Thames, Buckinghamshire. She died at the age of 1 on October 10th, 1234 in Marlowe-on-Thames, Buckinghamshire.
Henry Plantagenet of Almaine
Henry was born on November 2nd, 1235 in Haughley Castle, Suffolk. He died in Church de St. Silvestro, Viterbo, Latium, Italy.
Richard Plantagenet
Richard was born in 1237 in of Cornwall, England. He died at the age of 9 in 1246.
Nicholas Plantagenet
Nicholas was born in Berkhamsted Castle, Hertfordshire. He died in Berkhamsted Castle, Hertfordshire.
John Plantagenet
John was born in Marlowe-on-Thames, Buckinghamshire. He died on September 22nd, 1233 in Marlowe-on-Thames, Buckinghamshire.
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