The UK cannot claim credit for the invention of horse racing since it dates back as far as the time of Ancient Greece. However, modern day horse racing is said to have been developed in the UK with the introduction of the Arabian thoroughbreds that were brought back to the country in the 12th century after the Crusades. This was when horse racing started making waves in the UK. While horse racing was introduced to the country at that early era, it did not really become that popular until a few centuries later when race tracks and courses were established and formal rules were formed.