Natroun over 2400 metres at Longchamp Racecourse on 7 May. Two weeks later he contested the Prix de l'Avre over the same course and distance and won by five lengths from Bilal. Following the race, the colt's owner paid a supplementary entry fee of approximately £15,200 to enter the horse in the Prix du Jockey-Club, reportedly at the urging of Saint-Martin. On 7 June, Natroun contested the 150th running of the Prix du Jockey-Club over 2400 metres at Chantilly Racecourse. In France, horses in the same ownership or stable are coupled for betting purposes. The Vincent O'Brien pair Ancient Times and
Prix Daru Viscount Paul Daru, who served as president of the Société d'Encouragement, in 1877. The Prix Daru was one of several trials for the Prix du Jockey Club collectively known as the Poules des Produits. The others (listed by their modern titles) were the Prix Lupin, the Prix Hocquart, the Prix Noailles and the Prix Greffulhe. From 1885, the Prix Daru was restricted to horses whose dams were born outside France. The event was funded by entries submitted before a horse's birth, in the year of its conception. The race merged with the Prix Noailles during the 1940s. The combined event,