Sophia Sidney, Baroness De L'Isle and Dudley, was the eldest illegitimate daughter of William IV of the United Kingdom and his longtime mistress Dorothea Jordan. She was married to Philip Sidney, 1st
Lady De L'Isle and Dudley in 1832
William IV drawn by his daughter Sophia in 1837
Philip Sidney, 2nd Baron De L'Isle and Dudley, was an English hereditary peer.
