Associazione Calcio Siena is a football club based in Siena, Italy. The club was formed in 1904 and currently plays in Italian Serie A, a return they made in 2003 after last playing in Italy's top division in 1946. The team's colors are white and black. It was first formed in 1904 as Società Studio e Divertimento (Society for Study and Entertainment), a sports club characterized by a black and white check jersey (derived from the city of Siena coat of arms). It opened its football section, called Società Sportiva Robur, in 1908. The team finally became known as Associazione Calcio Siena in 1933/1934. In 1934/1935 Siena were promoted for the first time to Serie B.