Club Atlético Peñarol is a professional football club based in Montevideo, Uruguay. Founded in 1891, it is one of the oldest and most successful clubs in South America. Peñarol has won numerous national championships and is a prominent competitor in international tournaments, including the Copa Libertadores. The club's colors are black and yellow, and its home matches are played at the Estadio Campeón del Siglo, which has a capacity of over 40,000 spectators. Peñarol has a fierce rivalry with Nacional, another historic club in Uruguay, and their matches are known as the Clásico del fútbol uruguayo.