In 1605 the Gunpowder Plot was a failed assassination attempt to kill King James I of England. Thirteen young men planned to blow up the Houses of Parliament. Among them was Guy Fawkes, Great Britain's most notorious traitor. With their actions, they would kill the King James I, maybe even the Prince of Wales, and the Members of Parliament who were making life difficult for the Catholics in England.

More Info: en.wikipedia.org