Maria Louisa St. John (1813-1861) (1813–1861) Parents Henry St John, 4th Viscount Bolingbroke, 5th Baron St John Maria St. John-Mildmay Children Siblings Anne Jane Charlotte St. John Henry St John, 5th Viscount Bolingbroke, 6th Viscount St John Emily Arabella Jane St. John Isabella Letitia St. John Spencer Mildmay St. John Partners John Lauriston Kneller