General Notes

Gilbert, Count of Brionne, who was son of Godfrey, Count of Brionne, illegitimate son of Richard I, the Fearless, Duke of Normandy.  [Magna Charta Sureties, line 157-1]

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Gilbert, Count of Brionne; benefactor of the Abbey of Bec in Normandy. [Burke's Peerage]

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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]

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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]

Note: I have Gilbert Crispin of Tillieres and Gilbert Count of Brionne as two different people.