Domesday Descendants says that Robert de Rumilly was "doubtless father also of Lucy wife of Jordan de Sai", but does not explain the reasoning. According to Gallia Christiana, the abbey of Aunay was founded 15 Jul 1131 by Jordan “de Saio prope Argentomum” and Lucy his wife. Henry II King of England confirmed the possessions of the abbey of Aunay, including donations by "Jordani de Saio et Lucie uxoris sue", by charter dated to [1181/89]. 1
...There does not appear to have been a surviving male heir and after the death of Robert, Cecily de Rumilly and her sister, Lucy, were valuable heiresses, with Lucy receiving land in Normandy, together with some in Oxfordshire, and Cecily claiming the bulk of her father's lands in England, turning her attention to the barony of Skipton. 2
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