All English Thoroughbreds can be traced back to three Arab stallions born between 1680 and 1724. Other breeds are often crossed with English Thoroughbreds to make them more elegant. English Thoroughbreds were particularly influential on the development of warmbloods such as Trakehners, Holsteiners, Quarter horses and Morgan horses. Fun fact English Thoroughbreds can even be crossed with pony breeds to make them more elegant.