At around midnight between the 4th and 5th of November, one Guido Fawkes was discovered hiding beneath the Houses of Parliament in London, keeping company with a very large quantity of gunpowder (more than enough to reduce the buildings above to rubble). Fawkes was caught due to an anonymous tip to the police, and upon his arrest, the conspiracy for which he was the triggerman quickly disintergrated. Most of the other conspirators fled, but they were either shot down or captured by the authorities.
The Gunpowder Plot, as it became known, was an attempt by a group of pro-Catholic sympathisers to destroy a government that they felt was too Protestant, and install in its place a more Catholic regime in England. They were highly committed to this cuase (Fawkes, for example, would almost certainly have died in the explosions he set off), but ultimately, they failed.
But even today, English speaking peoples everywhere remember Guy Fawkes as the only man ever to enter Parliament with honest intentions.
Guy Fawkes — The Krewmen