Sir Walter DE GRFY, of Rotherfield and Somerton, by Isabel, eldest daughter and coheir of William DE DUSTON, of Duston, co. Northampton. [Complete Peerage VI:144, (transcribed by Dave Utzinger)]
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Walter de Grey, to whom the same prelate extended his bounty by a grant of all his lands in Gilesford, in Kent, Brighthelmstone, in Sussex, with Herdewyke and Coges, co. Oxford which he had by assignment from Joan and Alice, the daus. and co-heirs of Robert de Arsic, Baron of Coges, and likewise the residue of the manor of Rotherfield, together with divers other lordships. This Walter d. in 52nd Henry III [1268], and was s. by his son, Robert de Grey. [Sir Bernard Burke, Dormant, Abeyant, Forfeited and Extinct Peerages, Burke's Peerage, Ltd., London, England, 1883, p. 247, Grey, Barons Grey, of Rotherfield, co. Oxford]