Henry St John, 4th Viscount Bolingbroke, 5th Baron St John British viscount (1786–1851) Parents Charlotte Collins George St John Children Henry St John, 5th Viscount Bolingbroke, 6th Viscount St John Anne Jane Charlotte St. John Emily Arabella Jane St. John Isabella Letitia St. John Maria Louisa St. John Spencer Mildmay St. John Siblings George St. John Henry Joseph St. John George Fredrick St. John Robert Barton Isabella St. John Ferdinand St. John George Richard St. John Charles Robert St. John Edward Barton John Dyson St. John George Barton Charles Barton Antonia St. John Partners Maria St. John-Mildmay