 Complete the following phrase:  Louis Chiron  was Monacos first Formula One driver. He is better known for his pre-war efforts in motorsport, having won 21 Grands Prix including the 1931 Monaco Grand Prix before the World Championship began in 1950. He was 50 when the first World Championship Grand Prix came around. His only points finish was a 3rd at his home race in Monaco in 1950. He did the full 1951 season bar the Indy 500 and only made sporadic appearances after that. He is still the oldest person to take part in a grand prix being 55 years when he competed in the 