Rugby league football, usually called rugby league, or simply league, is a full contact sport played by two teams of thirteen players on a rectangular field. One of the two codes of rugby football, it originated in England in 1895 as a split from the Rugby Football Union over the issue of payments to players. Its rules gradually changed with the purpose of producing a faster, more entertaining game for spectators. It has been cited as the toughest, most physically demanding of team sports.