Darley Arabian
The Darley Arabian sired the undefeated Flying Childers. He also sired Bartlett's Childers, an unraced brother of Flying Childers, who was the great-grandsire of the extremely influential Eclipse. The Darley Arabian was to become the most important sire in the history of the English Thoroughbred. His son Bulle Rock was the first Thoroughbred to be exported to America, in 1730.