Countess of Hertford is a title given to the wife of the Earl of Hertford. Women who have held the title include: Isabel Marshal (1200–1240) Maud de Lacy, Countess of Hertford and Gloucester (1223-1289) Lady Katherine Grey (1540-1568) Frances Howard, Duchess of Richmond (1578-1639) Frances Seymour, Duchess of Somerset (1699–1754) Isabella Seymour-Conway, Countess of Hertford (1726-1782)