The late Sir Henry Cooper was often regarded as the most popular of all English boxers. At one time he was the British, European and Commonwealth heavyweight champion. Cooper fought Muhammad Ali twice. In 1963 in a non-title fight at Wembley Stadium Cooper knocked Ali down in the fourth round with his trademark left hook 'Enry's 'Ammer'. In 1966 they met a second time to contest the world title. Cooper succumbed and Ali went on to be 'The Greatest'.