Thomas Vaughan was a blackmailer and "notorious villain". In 1703 he and Thomas Davis were convicted of trying to extort money from Mr Barker an Apothecary, and Mr Guillam a Tallow-Chandler, by threatening to denounce them for sodomy.
Vaughan and Davis were sentenced to stand in the pillory at Temple Bar and Charing Cross; to be whipped from Temple Bar to Charing Cross, and to pay a Fine of £5 each and remain in Prison until it was paid. 
- http://www.rictornorton.co.uk/eighteen/1707vaug.htm Rictor Norton (Ed.), "Trials of Thomas Vaughan and Thomas Davis, 1707," Homosexuality in Eighteenth-Century England: A Sourcebook. 29 April 2007, updated 15 June 2008