Another theory originated from the Derby Horse Racing founded by 1780 Earl of Derby 12. "Derby" refers to the English town Derby, where horse racing is held in Britain, and the horse racing produced by Derby is even more famous in the British horse racing industry. After 1870, sir. Derby founded the British Jockey Club. He holds a horse race in Epsom near London on the first Wednesday of June every year. This is one of the most famous horse races in Britain, and this day is also named Derby Day. In horse racing, most horses come from Derbyshire, and "Derby War" is used to describe "the race between horses from Derbyshire". Gradually, "Derby" was extended to other sports fields, and the British quoted it to describe the fierce competition between two teams in the same city. This is a derby! The atmosphere of the derby against the players and fans of both sides is more steaming than that of the general game. If the two sides have a hostile relationship with religious factions or political differences, the tension of competition will be more intense. The derby example of political hostility is Barcelona in Spain versus the Spaniards. Barcelona represents the residents who are loyal to Catalan nationalism, and the Spanish (Spanish is a Catalan-speaking Spanish) represents the residents who moved to Catalonia from other regions during Franco's period and supported the unification of Spain. In addition, Barcelona can also be regarded as a political derby against Real Madrid. Real Madrid is supported by Spanish dictator Francisco Franco, and Barcelona is a symbol of Catalonia. It opposes Franco's Spanish nationalism and is supported by the opposition and the left. An example of a religious rival derby is the old-fashioned battle in Glasgow, Scotland. Celts represent the Roman Catholic population, while vagrants represent the Protestant population in the same city. Derby usually represents a game between two teams located in the same city or nearby areas, but sometimes national rival teams in history, such as Ajax in the Netherlands versus Eindhoven or Inter Milan against Juventus, can also be called Derby.