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Daughter of Hugues Ier de Dammartin, comte de Montdidier and Rohese de Clare Wife of Guy de Possesse Mother of Eustachie de Possesse Sister of Pierre de Dammartin, Comte de Dammartin-en-Goële; Comte Hugues II de Dammartin, Count of Dammartin; Eudes II ou Hugues de Dammartin, Lord of Mendlesham, Suffolk and Aelis de Dammartin Half sister of Lady Marguerite De Mandeville; Robert Giffard and Alberic II de Dammartin