Guillaume (unknown) 
Isabel Eustace Isabelle
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| Guillaume (unknown) |
| Isabel Eustace Isabelle
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Guillaume FitzWilliam de Breteuil, seigneur de Breteuil
abt 1052, Breteuil, Eure, Normandy France - 1099, Bedford, Normandy France
(unknown mistress)
abt 1052 - ??
Married: (no)
Isabel Breteuil
abt 1075, Breteuil, Eure, Normandy France - 1121, Bravel France
Eustace de Pacy
abt 1090, Pace-sur-Eure, Eure, Normandy France - 1136
Isabelle de Crepon, dame de Crepon
?? - ??