Maud Fitz Geoffrey, died 1236, Countess of Essex, daughter of Geoffrey Fitz Piers, died 1213, Earl of Essex, and Beatrix de Say, daughter of William de Say. [Magna Charta Sureties]
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Maud, dau. of Geoffrey Fitz-Piers, Earl of Essex, and eventually heiress of her brother, William de Mandeville, last Earl of Essex of that family. [Sir Bernard Burke, Dormant and Extinct Peerages, Burke's Peerage, London, 1883, p. 57, Bohun, Earls of Hereford, Earls of Essex, Earls of Northampton, and High Constables of England]