Herleva

Herleva  (c. 1003 – c. 1050) was a Norman woman of the 11th century, known for three sons: William I of England "the Conqueror", an illegitimate son fathered by Robert I, Duke of Normandy; and Odo of Bayeux and Robert, Count of Mortain, who were both fathered by her husband Herluin de Conteville. All three became prominent in William's realm. 
Credit: Wikipedia