This is a Thoroughbred Horse. You'll see these dashing beasts commonly on the race track! Why TB's in particular? These horses are the world's fastest breed! All modern Thoroughbreds can trace their pedigrees to three stallions ( the Byerley Turk, the Darley Arabian, and the Godolphin Arabian ) imported to England in the 17th century and a wide variety of foundation mares. The first TB in America was a young stallion named Bulle Rock in 1730.