The aim of the 1820 Cato Street Conspiracy, organized by revolutionary Arthur Thistlewood, was the assassination of the entire British Cabinet. Earlier, in 1816, Thistlewood helped plan the Spa Fields Riots, during which the Bank of England and Tower of London were to be seized. In February, 1820, Thistlewood learned the entire British Cabinet planned to dine at the Earl of Harrowby?s house in London?s Grosvenor Square. His plot for murder was revealed to the police, who apprehended Thistlewood and a number of accomplices as they prepared to leave a room on Cato Street for Grosvenor Square. Thistlewood was tried for high treason and hanged, along with four others.