From the year 1967 , there have been a total of seven clubs in Europe to win the table in their history. Something to enlighten you all. 1) Barcelona are the only Club in Europe to win the Treble twice. 2) A.C. Milan have been invincible in Italy, they went over 630, six hundred and thirty days. But failed to win a treble. 3) Neither have mighty Real Madrid won it Real have won the most la Liga's and most campion league 15 , but never have won the treble as yet. 1) Celtic. Scotland. 1966/1967. 2) Ajax Holland. 1971/1972. 3) P.S.V. Eindhoven . Holland. 1987/1988. 4) Manchester United. England. 1998/199. 5) Barcelona . Spain. 2008/2009. 6) Inter Milan Italy. 2009/2010. 7)Bayern Munich. Germany. 2013/2014. 8) Barcelona. Spain. 2014/2015.