Associazione Calcio Siena is a football club based in Siena, Italy. The club was formed in 1904 and currently plays in Italian Serie A, having arrived there in 2003 for the first time. The team's colors are white and black. Its stadium is named Stadio Artemio Franchi, although its capacity is only 15,725 and is located in Siena, whereas its more famous namesake is located in Florence.