Who attempted to become the first world Light-Heavyweight champion in boxing history to win the world's Heavyw?

Who attempted to become the first world Light-Heavyweight champion in boxing history to win the world's Heavyweight championship?|||In 1939, John Henry Lewis tried to become the first Light Heavyweight champion in boxing history to go up in weight and conquer the world's Heavyweight championship when he faced world Heavyweight champion Joe Louis. Joe Louis knocked him out in the first round.|||Bob Fitzsimmons was a former light heavyweight champ that did win the heavyweight title by beating James J. Corbett in 1897 but I believe the first one to attempt to win the title from the heavyweight champ as a light heavyweight champion already was was Philadelphia Jack O'Brien who fought heavyweight champion Tommy Burns to a draw in 1906.