Archibald Primrose, Lord Dalmeny British politician; (1809-1851) (1809–1851) Parents Harriet Bouverie Archibald Primrose, 4th Earl of Rosebery Children Everard Henry Primrose Archibald Primrose, 5th Earl of Rosebery Constance Wyndham, Baroness Leconfield Lady Mary Hope Siblings Augustus Fitzwalter St. John-Mildmay Horace Osborne St. John-Mildmay Bouverie Francis Primrose Lady Mary Anne Primrose Lady Harriet Primrose Edmond St John-Mildmay Lady Anne Primrose Lady Louisa Primrose Partners Wilhelmina Powlett, Duchess of Cleveland