Gunpowder Plot
As a member of the King's Bodyguard, Percy was able to lease rooms next to the House of Lords, in May 1604. The plotters' original idea was to dig their way under the foundations of the Lords chamber to put the gunpowder there. The main idea was to kill James, but many other important targets would be present, including most of the Protestant nobility and senior bishops of the Church of England. Guy Fawkes, as "John Johnson", was put in charge of this building, where he posed as Percy's servant. Catesby's house in Lambeth was used to store the gunpowder with the tools for digging.