The American Horse was further refined in Kentucky, where the addition of more Thoroughbred blood created a taller and better-looking horse that became known as the Kentucky Saddler. There were originally seventeen foundation stallions listed by the breed registry, but by 1908 the registry decided to list only one and the remainder were identified as "Noted Deceased Sires." Today, two foundation sires of the breed are recognized, both Thoroughbred crosses. The first was Denmark, son of an imported Thoroughbred, who for many years was the only recognized foundation stallion. His son, Gaines' Denmark, was in the pedigrees of over 60 percent of the horses registered in the first three volumes of the breed's studbook. A second foundation sire was recognized in 1991, Harrison Chief. This sire was a descendant of the Thoroughbred Messenger, who is also considered a foundation stallion for the Standardbred breed.