Isabel Marshal

Isabel Marshal
Countess of Hertford; Countess of Cornwall
Born9 October 1200
Pembroke Castle, Wales
Died17 January 1240(1240-01-17) (aged 39)
Berkhamsted Castle, Hertfordshire, England
Burial
SpouseGilbert de Clare, 4th Earl of Hertford
(m. 1217–30; his death)
Richard, 1st Earl of Cornwall
(m. 1231–40, her death)
IssueAgnes de Clare
Amice de Redvers, Countess of Devon
Richard de Clare, 6th Earl of Hertford
Isabel de Brus, Lady of Annandale
William de Clare
Gilbert de Clare
Henry of Almain
FatherWilliam Marshal, 1st Earl of Pembroke
MotherIsabel de Clare, 3rd Countess of Pembroke

Isabel Marshal (9 October 1200 – 17 January 1240) was a medieval English countess. She was the wife of both Gilbert de Clare, 4th Earl of Hertford and 5th Earl of Gloucester and Richard, 1st Earl of Cornwall (son of King John of England). With the former, she was a great grandmother of King Robert the Bruce of Scotland.