What is "nasrullah"

Nasrullah (March 2, 1940 – May 26, 1959) was a Thoroughbred racehorse that was bred in Ireland and trained in the United Kingdom before becoming a champion sire in both Europe and North America. As a two-year-old, he won the Coventry Stakes and finished second in the Middle Park Stakes, ending the year as the top-rated colt of his generation. In the following season, he became increasingly difficult to manage, and his temperament compromised his racing career. He was the beaten favourite in the 2,000 Guineas and finished a close third in the Derby Stakes before winning the Champion Stakes. As a breeding stallion he stood in England, Ireland, and the United States and had great success in each location.