 Complete the following phrase:  Celtic first participated in European competition during the 196263 season, their third-place finish in the league the previous season qualifying them for the Inter-Cities Fairs Cup. They went on to reach two European Cup Winners Cup semi-finals in 1964 and 1966, before going on to become the first British club to win the European Cup in 1967, defeating Inter Milan 21 in the final. Celtic reached the European Cup Final again in 1970, but lost to Feyenoord. Their last appearance in a European final was in 2003 when they lost 32 to FC Porto in the 