The city of Milan, Italy was famous worldwide for its fashion. But, in the hearts of the football fans, the city had nothing to do with fashion. There was only one reason why the city's name was known around the world—football.
The word "derby" in the sporting world was first used in horse racing, but it was football that carried it forward all over the world. There were many wonderful classic derbies in the football world, but no derby was more attention-grabbing than a derby between two sides from the same city.
In Spain, the El Clásico between Real Madrid and Barcelona shone brightly, but in the minds of the players and fans the real derbies were the Madrid Derby between Real Madrid and Atlético Madrid and the Barceloní derby between Barcelona and RCD Espanyol. The same city derby was always the most eye-catching match, such as the most intense city derby in the world—the "Old Firm" derby of Glasgow, Scotland.