Henry St John, 5th Viscount Bolingbroke, 6th Viscount St John British Viscount (1820–1899) Parents Maria St. John-Mildmay Henry St John, 4th Viscount Bolingbroke, 5th Baron St John Children Henry Mildmay St. John Charles Reginald St. John Ellen Rose St. John Vernon Henry St John, 6th Viscount Bolingbroke, 7th Viscount St John Siblings Anne Jane Charlotte St. John Maria Louisa St. John Emily Arabella Jane St. John Isabella Letitia St. John Spencer Mildmay St. John Partners Mary Emily Elizabeth Howard