Gilbert, Earl of Brion, had two sons, Richard, ancestor of the house of Clare, and Baldwin de Brionis. [Sir Bernard Burke, Dormant and Extinct Peerages, Burke's Peerage, London, 1883, p. 139, Courtenay, Barons Courtenay, Earls of Devon]
----------Gislebert, surnamed Crispin, Earl of Brion, in Normandy, whose eldest son [was] Richard FitzGilbert. [Sir Bernard Burke, Dormant and Extinct Peerages, Burke's Peerage, London, 1883, p. 118, Clare, Lords of Clare, Earls of Hertford, Earls of Gloucester]