In Thoroughbred racehorse breeding the founder stallions imported in 18th century to UK were Darley Arabian Byerly Turk What was third stallion called?

These three stallions, Darley Arabian, Byerly Turk, and Godolphin Arabian, are known as the "Three Founding Sires" of the Thoroughbred breed. They are considered to be the most important foundation stallions because their descendants make up the vast majority of the Thoroughbred gene pool today.