This rivalry has an obvious and glamourous appeal, Spain’s two biggest sides doing battle at least twice a season in El Clasico.
Of course this game is more than just about football and also provides a potent mix of history, regionalism, culture and politics.
Barcelona have long been proud to be a defiant symbol of Catalan nationalism, especially during the Franco era, while Real Madrid are seen as the club of the Spanish establishment with their royal links.
On the pitch Real Madrid have won 32 Spanish titles, while Barcelona have won 22. No other team has reached double figures.
As a spectacle this rivalry has always been able to boast some of the world’s best players, including Diego Maradona, Zinedine Zidane, Ronaldo, Johan Cruyff and Ronaldinho.
Today El Clasico is the most eagerly awaited fixture in the football calendar as it also serves as a personal contest between the world’s two best players, Lionel Messi and Cristiano Ronaldo.