Margaret Holles, Duchess of Newcastle-upon-Tyne English noble (1661–1716) Parents Frances Pierrepont Henry Cavendish, 2nd Duke of Newcastle Children Henrietta Harley, Countess of Oxford and Countess Mortimer Siblings Elizabeth Monck, Duchess of Albemarle Lady Arabella Cavendish Henry Cavendish, Earl of Ogle Lady Catherine Cavendish Lady Frances Cavendish Partners John Holles, 1st Duke of Newcastle
