Arthur Thistlewood (1770-1820). English conspirator. Portrait. Instigator of the Cato Street Conspiracy, a plot to assassinate Viscount Castlereagh and other ministers. The conspirators were captured and arrested. Arthur Thistlewood and four others were convicted of high treason and hanged. They were also decapitated. Image taken from An authentic History of the Cato-Street Conspiracy; with the trials at large of the conspirators for high treason and murder; a description of their weapons and combustible machines, and every particular connected with the horrid plot. With portraits of all the conspirators and other engravings. Originally published in Thomas Kelly: London, 1820.