Algernon Sidney, 4th Baron De L'Isle and Dudley of Penshurst (1854-1945) (1854–1945) Parents Mary Foulis Philip Sidney, 2nd Baron de Lisle and Dudley Children Siblings Mary Sophia Sidney Philip Sidney, 3rd Baron De L'Isle and Dudley of Penshurst William Sidney, 5th Baron De L'Isle and Dudley of Penshurst Henry Sidney