Elizabeth Bentinck British noble (1735-1825) (1735–1825) Parents Margaret Cavendish Bentinck, Duchess of Portland William Bentinck, 2nd Duke of Portland Children Lady Isabella Thynne Thomas Thynne, 2nd Marquess of Bath Mary Thynne Sophia Thynne Louisa, Countess of Aylesford Henrietta Thynne John Thynne, 3rd Baron Carteret George Thynne, 2nd Baron Carteret Siblings William Cavendish-Bentinck, 3rd Duke of Portland Lady Henrietta Cavendish-Bentinck Lord Edward Bentinck Partners Thomas Thynne, 1st Marquess of Bath