The Byerley Turk is a notable horse from the late 17th century, recognized as one of the foundation sires of the modern Thoroughbred breed. He was imported to England in 1689 and is believed to have been a gift to King James II. The horse was known for his speed and stamina, traits that were highly valued in racing. Byerley Turk's lineage is significant, as he contributed to the genetic pool of many famous racehorses. His descendants include several prominent racehorses and stallions, making him an essential figure in the history of horse racing and breeding.