Prix Jean Prat metres. For a period it was held in April, and it served as a trial for the Prix du Jockey Club. Both Prix Biennal races were renamed the Prix Jean Prat in 1940. This was in memory of Jean Prat (1847–1940), a successful racehorse owner and breeder. The version for three-year-olds was switched to late May or early June in 1961. It was shortened to 1,850 metres in 1962. It was transferred to Chantilly and cut to 1,800 metres in 1967. The present system of race grading was introduced in 1971, and for several years the event held Group 2
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,