Henry St John, 1st Viscount St John

In November 1684 he was the principal figure in a singularly disgraceful brawl, which followed the acquittal of Edward Nosworthy. The trial's jury repaired to the Globe tavern in Fleet Street to celebrate. While there, an altercation broke out between St John and Francis Stonehouse, the argument reportedly "a discourse about leaping horses" which terminated in the death of the jury foreman, Sir William Estcourt. St. John and Edmund Webb, who had both run Estcourt through with their swords,^[2] were found guilty of murder, and condemned to death. St. John's mother obtained a pardon for him at the reported price of £16,000. St. John was expected to go abroad for some time, but publicly entered the next parliamentary election at Wootton Bassett a few weeks after the close of his case, and was duly elected to James II’s first Parliament.^[3]

St John was twice married:

• 1st, on 11 December 1673, Lady Mary Rich (died 30 September 1678), daughter and coheir of Robert Rich, 3rd Earl of Warwick, by whom he had one son, Henry, later made Viscount Bolingbroke in 1712.
• 2nd, on 1 January 1687, Angelica Magdalena (died 5 August 1736), daughter of Claude Pellissary, treasurer-general of the galleys to Louis XIV, and widow of Philip Wharton of Edlington, Yorkshire, by whom he had three sons (two of whom died in their father's lifetime) and one daughter, Henrietta Knight, Lady Luxborough.^[1] The surviving son was John St John, 2nd Viscount St John, father of Frederick St John, 2nd Viscount Bolingbroke, 3rd Viscount St John.

St John succeeded his father as 4th Baronet on the latter's death in 1708, then on 2 July 1716 he was created a peer as 1st Viscount St John, elevating him to the House of Lords.

Viscount St John died 8 April 1742, aged 89, and was buried at St Mary's Church, Battersea.