Alfa Romeo returns to Formula 1 this season with Sauber, and this is its new challenger, the C37. Despite being powered by a Ferrari engine, Alfa Romeo's comeback restores one of the great names in the history of motorsport's premier championship, and marks the return of the 'Quadrifoglio', the legendary badge that has appeared on Alfa Romeo's top performance cars since 1923. Featured on the engine cover of the new C37, the famous good-luck charm has a fascinating history, deeply rooted in the racing world. The first Alfa Romeo car to carry the Quadrifoglio was the 'RL' driven by Ugo Sivocci which won the 15th edition of the Targa Florio in 1923. The same good-luck emblem also appeared on Brilli Peri's 'P2' when he triumphed in the first 'Motor Racing World Championship' in Monza in 1925, gaining the first of Alfa Romeo's five World Titles, and it was present again in 1950 and 1951, when Giuseppe 'Nino' Farina and Juan Manuel Fangio drove the Alfa Romeo 158 and 159 cars, the famous 'Alfettas', to success in the first two Formula 1 World Championships.