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Following copied from a paper by John S Moore, University of Bristol in "Prosopon, Newsletter of the Unit for Prosopographical Research", Oxford University website: www.linacre.ox.ac.uk/research/posop/Prosopon11.doc
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Gilbert de Maminot's barony of West Greenwich (Kent) passed on his death in 1101 to his son Hugh and on Hugh's death before 1131 to Hugh's son Walkeline I, and to the latter's son Walkeline II by 1157. When Walkeline II died childless c. 1190, his heir was his aunt Alice, daughter of Hugh de Maminot.
Source indicated: Sanders, "English Baronies", pp. 97-8 and references cited, p. 97, nn. 9-10. The Emma who temporarily controlled the Maminot barony in 1129-30 (P.R. 31Hen. I, p. 67) was presumably Hugh's widow.
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Based on the note contained in the Sources for John S Moore, I assume that Hugh d. 1129, and his widow Emma died in 1130/1.