Beginning in 1946, the FIA have been the primary governing body of Formula One. Grand Prix motor racing had existed in some form since the 1920s, however in 1946 the FIA first defined the existence of a primary "Formula" with its own rules of competition. The first race under the new regulations was the 1946 Turin Grand Prix. Four years later, the FIA created the premise of the first Drivers' World Championship to be held in 1950 as a parallel to the Motorcycle World Championships which had been formed a year earlier. A Constructors' Championship was introduced in 1958. Formula One has been governed by the FIA ever since.