A Liverpool supporter wrapped in a Union flag walks past police forces who are attempting to prevent Liverpool supporters from entering the Parc des Princes stadium in Paris, ahead of the European Cup final football match between Liverpool and Real Madrid, on May 27, 1981. - The 1981 final at the Parc des Princes in Paris earned Liverpool a third European crown in five seasons, at around the midway point of the club's most dominant era. Real Madrid can become the first side in 42 years to win three consecutive European Cups when the Spanish giants take on Liverpool in the Champions League final on May 26, 2018. (Photo by Dominique FAGET / AFP) (Photo credit should read DOMINIQUE FAGET/AFP via Getty Images)
