When Liverpool met Real Madrid in the Champions League final in Kiev three years ago, it was a collision of two of the grand old names of the European Cup.
Real Madrid were crowned champions for the 14th time and 12 months later Liverpool claimed the title for the sixth time in their history, a number matched by Bayern Munich last year.
In Porto, on Saturday, comes a celebration of the new power in world football. Two historic clubs extending into new territory with new money. Manchester City against Chelsea, Emirati sovereign wealth fund plays Russian oligarch.