Zij is getrouwd met Willem Henry Cavendish-Bentinck Hertog van Portland.
Zij zijn getrouwd op 8 november 1766, zij was toen 16 jaar oud.
Kind(eren):
Lady Dorothy Cavendish was born on 27 August 1750. She was the daughter of Sir William Cavendish, 4th Duke of Devonshire and Charlotte Elizabeth Boyle, Baroness Clifford.
She married William Henry Cavendish-Bentinck, 3rd Duke of Portland, son of William Bentinck, 2nd Duke of Portland and Lady Margaret Cavendish Harley, on 8 November 1766.
She died on 3 June 1794 at age 43.
Her married name became Cavendish-Bentinck.
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