Real Sociedad de Football, S.A.D., more commonly referred to as Real Sociedad, is a Spanish professional sports club in the city of San Sebastian, Basque Country, founded on 7 September 1909. It plays its home matches at the Anoeta Stadium. Real Sociedad won the Liga title in 1980–81 and 1981–82, and last finished runner-up in 2002–03. The club has also won the Copa del Rey twice, in 1909 and 1987. It contests the Basque derby against rivals Athletic Bilbao. Real Sociedad was a founder member of La Liga in 1929; its longest spell in the top flight was for 40 seasons, from 1967 to 2007.