Jagiellonia Białystok (Polish pronunciation: [jaɡʲɛˈlɔɲɲa bʲaˈwɨstɔk]) is a Polish football club based in Białystok that plays in the Ekstraklasa, the top level of Polish football. Founded in 1920, Jagiellonia play their home games at Białystok City Stadium. The club won the Polish Cup in 2010, Super Cup and qualified to play in the third round qualification of the UEFA Europa League. It was the club's first appearance in the European cup. The club's most successful season was the 2014–15 season when they finished 3rd in the Ekstraklasa.