A plot to assassinate members of the British government. Under the leadership of Arthur Thistlewood, a revolutionary extremist, the conspirators planned to murder Lord Castlereagh and other ministers while they were at dinner, as a prelude to a general uprising. However, government spies revealed the plot and possibly also provoked the conspirators to take action. They were arrested at a house in Cato Street, off the Edgware Road, in London. Convicted of high treason, Thistlewood and four others were executed, the rest being sentenced to transportation for life.