Question: FK Partizan is a professional football club based in Belgrade, Serbia, and became the first Eastern European club to play in the European Cup final, losing by Real Madrid in which 1966 football match held at the Heysel Stadium, Brussels?
Sentence (from "FK Partizan in European football"): Founded in 1945, they were the first Yugoslav and Serbian club ever to enter European competition, playing the European Cup in the 1955–56 season.
Relevant evidence: No