A structure attached to the Houses of Parliament at Westminster, built by King William Rufus, and roofed and remodelled by Richard II.; was the scene of the trials of Wallace, Sir Thomas More, Strafford, Charles I., Warren Hastings, and others, as well as the installation of Cromwell as Lord Protector, and till 1883 the seat of the High Courts of Justice; is a place of great historic interest; has a roof composed of 13 great timber beams, and one of the largest in the world to be unsupported.