William "Guillaume" FitzOsbern Lord of Breteuil, 1st Earl of Hereford, Earl of Wessex, and companion of William the Conqueror 1
- Born: Abt 1016, Poitiers, Vienne, Poitou-Charentes, France
- Marriage (1): Adeliza de Tosni Countess of Hereford
- Died: 22 Feb 1071, Cassel, Nord-Pas-de-Calais, France (in the Battle of Cassel) about age 55
William married Adeliza de Tosni Countess of Hereford, daughter of Roger de Hispania de Tosny Seigneur of Conches and Godehilde Borrell Baroness of Tosni, Countess of Evreux. (Adeliza de Tosni Countess of Hereford was born about 1035 in Tosny, Eure, Normandy, France and died on 5 Oct 1070 in Lyre Abbey, Diocese Evreux, Normandy, France.)
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