Henry Joseph St. John (died 1857) (1799–1857) Parents George St John Isabella Charlotte Antoinette Sophia Baronin von Hompesch Children Siblings Henry St John, 4th Viscount Bolingbroke, 5th Baron St John George Fredrick St. John Robert Barton Isabella St. John Ferdinand St. John George Richard St. John Charles Robert St. John George St. John Edward Barton John Dyson St. John George Barton Charles Barton Antonia St. John Partners Isabella St. John