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 Greffulhe the Prix Lupin, the Prix Hocquart and the Prix Noailles. The Prix Greffulhe was restricted to the produce of mares born and bred in France. It was funded by entries submitted before a horse's birth, in the year of conception. The race was abandoned throughout World War I, with no running from 1915 to 1919. It was contested at Le Tremblay over 2,150 metres from 1943 to 1945. The Prix Greffulhe was transferred to Saint-Cloud and shortened to 2,000 metres in 2005. Twenty-three winners of the Prix Greffulhe have achieved victory in the Prix du Jockey Club. The first was