Emma de Guader, Countess of Norfolk

Emma Fitz-Osborn or Emma de Breteuil, and later Emma de Guader, was a Norman noblewoman, the wife of Ralph de Guader and the daughter of William FitzOsbern, Lord of Breteuil and later first Earl of Hereford of a new creation, who was a cousin and close adviser of William the Conqueror. William's opposition to their marriage led to the unsuccessful Revolt of the Earls.