T Square 200 or "The Spirit of Nelson" was the name given to the son et lumière event, held in Trafalgar Square on Sunday, October 23, 2005, to mark the bicentenary of the sea battle, the Battle of Trafalgar, fought between the British Royal Navy and the combined navies of France and Spain off Cape Trafalgar, Spain on 21 October 1805 under the command of British Admiral Lord Nelson.