Note:  Do not rely on this information. It is very old.

Cato Street Conspiracy

Cato Street Conspiracy, an insignificant plot to assassinate Lord Castlereagh and other ministers in 1820, and so called from the fact of the conspirators meeting at Cato Street (now John Street) in the Edgware Road. One of the gang betrayed the plot to the police, and Thistlewood and four others were hanged, while five were condemned to transportation.