This branch of the Cavendish family has been one of the richest and most influential aristocratic families in England since the 16th century , and has been rivalled in political influence perhaps only by the Marquesses of Salisbury and the Earls of Derby .
This branch of the Cavendish family has been one of the richest and most influential aristocratic families in England since the 16th century , and have been rivalled in political influence perhaps only by the Earls of Derby and the Marquesses of Salisbury .