 After the death of Enguerrand's only daughter Adelaide, her mother Adelaide of Normandy became her heir and hence through his marriage Odo acquired the title Count (or Earl) of Aumale in Normandy "Jure uxoris" (by right of his wife).Adelaide (sometime called Adeliza) was also sister of William the Conqueror, and Odo accompanied his brother-in-law in the Norman conquest of England (1066).Theobald III of Blois then seized Odo's counties in the Champagne region, One version states William I, for his services in the conquest gave Odo Holderness in Yorkshire.