Bred and raced by Edmond Blanc, he was by Flying Fox and out of Amie, whose sire Clamart also won the Grand Prix de Paris.

Ajax is a brother to Adam, a sire who was exported to the United States in 1906 and then in 1908 to Austria.

[1] Ajax was trained by Robert Denman and ridden by jockey, George Stern.

At stud, Ajax was an influential stallion[4] who sired Union (his first classic winner and the 3rd dam of Le Pacha) and Teddy.

His daughters produced the undefeated Havresac II, Invershin, Massine and Le Correge.