Prix Jean Prat
Both legs of the Prix Biennal were given a new title, the Prix Jean Prat, in 1940. This was in memory of Jean Prat (1847–1940), a successful racehorse owner and breeder. The older horses' version was held at Maisons-Laffitte from 1943 to 1945, and on the first occasion it was contested over 3,100 metres. It returned to Longchamp in 1946, and its regular distance was extended to 3,100 metres in 1955.