Gunnora belonged to a family from the Pays de Caux area in Normandy. Gunnora was probably born . Her family was very influential in western Normandy and Gunnora was said to be very wealthy. Her marriage to Richard I was of great political importance. It allied him with a powerful rival family in the Cotentin. Her brother, Herfast de Crepon, was the of a great Norman family. Her sisters and nieces married some of the most important nobles in Normandy. 