Gerard de Furnival m. Maud, eldest of the four sisters and co-heirs of Richard FitzJohn; she m. 2ndly, William, 11th Earl of Warwick. [Sir Bernard Burke, Dormant, Abeyant, Forfeited and Extinct Peerages, Burke's Peerage, Ltd., London, England, 1883, p. 225, Furnival, Barons Furnival]
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Richard FitzJohn d. s. p. 1297, and his lands devolved upon his heirs, [one of whom was] Maud, Countess of Warwick, his eldest sister who d. 1300. [Sir Bernard Burke, Dormant, Abeyant, Forfeited and Extinct Peerages, Burke's Peerage, Ltd., London, England, 1883, p. 209, FitzJohn, Barons FitzJohn]
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Maud FitzJohn, widow of Girard de Furnival, and one of the four daus. and co-heiresses of Richard FitzJohn, son of John FitzGeffrey, chief justice of Ireland. [Sir Bernard Burke, Dormant, Abeyant, Forfeited and Extinct Peerages, Burke's Peerage, Ltd., London, England, 1883, p. 30, Beauchamp, Earls of Warwick]