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Illegitimate son of Eustache, with the possibility (suggested by Alan V Murray) that he was the son of Godgifu, Eustache's first wife, and that their marriage was annulled due to consanguinity, making any children illegitimate.
Geoffroy de Boulogne son of Eustance de Boulogne and _____ married Beatice de Mandeville; child William de Boulogne