"The Spa Fields Riots was public disorder arising out of mass meetings at Spa Fields, Islington, England on 15 November and 2 December 1816. Revolutionary Spenceans, who opposed the British government, had planned to encourage rioting and then seize control of the government by taking the Tower of London and the Bank of England. Arthur Thistlewood and three other Spencean leaders were arrested and charged with high treason as a result of the riot; James Watson was on trial during June 1817 with Messrs Wetherell and Copley as their defence counsel. Watson was acquitted and the other three were released without trial."--Wikipedia.