From Horse

The Standardbred Horse is a relatively young breed just over 200 years old. Its origin dates from the England of the late 1700s, and specifically to a horse named "Mambrino." Mambrino had been a legend in 18th century England Trotting races for many years, and was the sire of "Messenger" — an English thoroughbred — credited with becoming the American ancestor of the Standardbred breed.