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 inciting a popular revolt to install James's daughter, Princess Elizabeth, as titular Queen. To this end he had already helped enlist nine Catholics into the conspiracy, but was running out of money and needed to recruit more men. Rookwood was a horse-breeder, and his stable of fine mounts at Coldham Hall was needed for the Midlands uprising. He had been asked to supply them with gunpowder about a year earlier, under the pretence that it was for William Stanley's regiment in Flanders—no longer an illegal operation due to the recent Treaty of London—but otherwise provided no funds for the conspiracy.