Ambrose Rookwood the House of Lords, Guy Fawkes, was discovered there and arrested. Rookwood fled the city, and informed Catesby and the others of the plan's failure. Together the remaining conspirators rode to Holbeche House in Staffordshire, where on 8 November they were attacked by the pursuing Sheriff of Worcester and his men. Catesby was killed, but Rookwood survived, and was imprisoned in the Tower of London. Rookwood and the survivors were arraigned on 27 January 1606 in Westminster Hall. Pleading not guilty, he claimed to have loved Catesby "above any worldly man". His subsequent request for mercy was ignored, however, and
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.