Gunpowder Plot under King James had faded, leaving many English Catholics disappointed. His fellow plotters were John and Christopher Wright, Robert and Thomas Wintour, Thomas Percy, Guy Fawkes, Robert Keyes, Thomas Bates, John Grant, Ambrose Rookwood, Sir Everard Digby and Francis Tresham. Fawkes, who had 10 years of military experience fighting in the Spanish Netherlands in the failed suppression of the Dutch Revolt, was given charge of the explosives. The plot was revealed to the authorities in an anonymous letter sent to William Parker, 4th Baron Monteagle, on 26 October 1605. During a search of the House of Lords at about midnight
Ambrose Rookwood (Jacobite) or assassinate William III. In February Thomas Prendergast, one of the conspirators, turned king's evidence, and the plot was revealed. On 27 March Rookwood was found in bed in a Jacobite alehouse, and committed to Newgate Prison. On 7 April a true bill of high treason was found against Rookwood at the Middlesex county sessions. He was brought before the King's Bench on 21 April. His case, tried with those of Robert Lowick and Charles Cranburn who was a Jacobite quartermaster, was the first treason trial to use the new system of procedure brought in by the Treason Act 1695,