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 it was "a potentially dangerous statement of faith". Ambrose and two of his brothers, Robert and Christopher, were educated by Jesuits at Saint-Omer, then in Flanders. Both brothers became priests (Ambrose's elder brother, Henry, became a Franciscan), and his half-sisters Dorothea and Susanna became nuns. According to the Jesuit Oswald Tesimond, Rookwood was "well-built and handsome, if somewhat short", which he compensated for by his taste in extravagant clothing. In author Antonia Fraser's opinion, this affectation was somewhat inappropriate at a time when "clothes were supposed to denote rank rather than money". In or shortly before 1599 he married Elizabeth,