Affirmed (February 21, 1975 – January 12, 2001) was an American Thoroughbred racehorse who was the eleventh of twelve winners of the United States Triple Crown of Thoroughbred Racing. Affirmed was also known for his famous rivalry with Alydar, whom he met ten times, including in all three Triple Crown races. Affirmed was the last horse to win the Triple Crown for a 37-year period which was ended in 2015 by American Pharoah.