Wikipedia
Herleva
Herleva ( 1003 – c. 1050) also known as Herleve, Arlette, Arletta and Arlotte, and Harlette had three sons – William I of England, who was fathered by Robert I, Duke of Normandy, and Odo of Bayeux and Robert, Count of Mortain, who were both fathered by Herluin de Conteville. All became prominent in William's realm.