Countess Isabel Marshall
- Born: 1200, Pembroke Castle, Pembrokeshire, Wales
- Marriage: Baron Gilbert III, Earl of Hertford, de Clare
- Died: 1240, Hertford Castle, Hertfordshire, England at age 40
Countess married Baron Gilbert III, Earl of Hertford, de Clare, son of Richard III FitzRobert, 4th Earl of Hertford, de Clare and Amice, Countess of Gloucester, de Mellant. (Baron Gilbert III, Earl of Hertford, de Clare was born in 1182 in Hertford, Hertfordshire, England and died in 1230 in Penrose, Bretagne, France.)
|