Gunnora de Crepon ^{1 2 3 4}

   Other names for Gunnora were Gonnor de Crepon, Gunnora Duchess of Normandy and Gunnor de Crêpon.

  Research Notes:

First wife of Richard I - Danish wife. Then married Emma. After Emma died about 968, married Gunnora in a Christian marriage to legitimize their children.

Herfast de Crepon was her brother.
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From http://cybergata.com/roots/442.htm :
Web Reference: Robert de Torigny and the family of Gunnor, Duchess of Normandy . We don't known the names of her parents, but we do know that she had three sisters and a brother. She was the Mistress of Richard I, Duke of Normandy, as well as being the Grandmother of William the Conqueror The descendants of Gunnor and her siblings had a great impact on English History by being part of the Norman Conquest of England. They were ancestors of the Fitz Osberns, the Montgomerys, the Mortimers, the Warennes, the Giffards and the Beaumonts.

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From Wikipedia - Gunnora, Duchess of Normandy :

Gunnora or Gunnor (c. 936-1031) was the wife and consort of Richard I of Normandy . Her parentage is unknown, earliest sources reporting solely that she was of Danish ancestry and naming siblings including brother Herfast de Crepon who is sometimes erroneously given as her father.

She was living with her sister Seinfreda, the wife of a local forester, when Richard, hunting nearby, heard of the beauty of the forester's wife. He is said to have ordered Seinfreda to come to his bed, but the lady substituted her unmarried sister, Gunnora. Richard, it is said, was pleased that by this subterfuge he had been saved from committing adultery, and the two became lovers. Gunnora long acted as Richard's mistress or wife by more danico , but when Richard was prevented from nominating their son Robert to be Archbishop of Rouen , the two were married, making their children legitimate in the eyes of the church.

Gunnora, both as mistress and duchess, was able to use her influence to see her kin favored, and several of the most prominent Conquest-era Norman magnates, including the Montgomery , Warenne , Mortimer , Vernon/Redvers , and Fitz Osbern families, were descendants of her brother and sisters.

Richard and Gunnora were parents to six children:
Richard II "the Good", Duke of Normandy (966)
Robert , Archbishop of Rouen , Count of Evreux , died 1037.
Mauger, Earl of Corbeil , died after 1033.
Robert Danus, died between 985 and 989
Emma of Normandy (c. 985-1052) wife of two kings of England.
Maud of Normandy, wife of Odo II of Blois , Count of Blois, Champagne and Chartres

Gunnora married Richard I Duke of Normandy, son of William I "Longsword" Duke of Normandy and Sprote de Bretagne à la Danoise. (Richard I Duke of Normandy was born on 28 Aug 933 in <Fécamp>, Normandy, France, died on 20 Nov 996 in Fécamp, (Seine-Maritime), Normandy, France and was buried in Fécamp, (Seine-Maritime), Normandy, France.)