Isabel Marshal medieval English countess (1200–1240) Parents Isabel de Clare, 4th Countess of Pembroke William Marshal, 1st Earl of Pembroke Children Isabella of Cornwall Richard de Clare, 6th Earl of Gloucester Amice de Clare Agnes de Clare Nicholas of Cornwall William de Clare John of Cornwall Henry of Almain Gilbert de Clare Isabella of Gloucester and Hertford Siblings Maud Marshal Sibyl Marshal Anselm Marshal, 6th Earl of Pembroke Walter Marshal, 5th Earl of Pembroke Gilbert Marshal, 4th Earl of Pembroke Richard Marshal, 3rd Earl of Pembroke William Marshal, 2nd Earl of Pembroke Joan Marshal Eva Marshal Partners Richard of Cornwall Gilbert de Clare, 5th Earl of Gloucester
