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 du Jockey Club Club was staged at Longchamp in 1941 and 1942, and at Le Tremblay over 2,300 metres in 1943 and 1944. It returned to Longchamp for the following three years, and on the second occasion it was opened to foreign participants. The present system of race grading was introduced in 1971, and the Prix du Jockey Club was classed at the highest level, Group 1. The first foreign-trained horse to win was Assert in 1982. The distance was shortened to 2,100 metres in 2005. Nine winners of the Prix du Jockey Club have subsequently won the Prix de l'Arc de Triomphe.