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#4 Iker Casillas and Jose Mourinho
One of the biggest feuds for power in the history of football, Iker Casillas and Jose Mourinho's fight divided the fans into two major groups, one supporting Casillas and one supporting Mourinho.
One was a hero who had won two Champions League titles at the club in the past 15 years, and the other had just won the league with a record points total, and was the best manager in the world at the moment.
Things came to a boil when Pepe was shown a red card in an El Clasico, which led to a brawl in which Mourinho poked the then Barcelona assistant manager, Tito Vilanova, in the eye. After the match, Casillas called his Spanish teammates, Xavi and Iniesta to ease tension in the national team, but that did not go down well with Mourinho who saw this as betrayal.
Mourinho dropped Casillas for Diego Lopez for the rest of the season before leaving for Chelsea at the end of the season. The following season, Casillas won his third Champions League trophy with Real Madrid before moving on to Porto.
