FC Sion is a historic Swiss football club based in the city of Sion, in the canton of Valais, competing in the Swiss Super League. The club plays its home matches at the Stade de Tourbillon, a stadium with a famously intimidating atmosphere. Founded in 1909, Sion is one of Switzerland's oldest clubs and its players wear all white. The club's history is rich, but its most dominant era came under the presidency of Christian Constantin,