Elizabeth and her hosts are frequently invited to Rosings Park, the home of Lady Catherine de Bourgh, Darcy's aunt; coincidentally, Darcy also arrives to visit. Source: Internet
Mr. Bennet and Elizabeth are much amused by his obsequious veneration of his employer, the noble Lady Catherine de Bourgh, as well as by his self-important and pedantic nature. Source: Internet
The British upper classes preserve their status by interbreeding (Lady Catherine de Bourgh is insistent on the point). Source: Internet
Lady Catherine wants Mr. Darcy to marry her daughter (his cousin) Anne De Bourgh and thinks that Elizabeth is beneath him. Source: Internet