Bertha Roberts 1
Another name for Bertha was Bertha l'Aigle.
Bertha married Henri de Ferrières, son of Walchelinde de Ferrières Seigneur of Ferrières-Saint-Hilaire and Unknown. (Henri de Ferrières was born about 1036 in Ferrières, Normandy, France, died between 1093 and 1100 and was buried in Tutbury Priory, Tutbury, Staffordshire, England.)
Wikipedia.org, Robert de Ferrers, 1st Earl of Derby.