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 La Force can serve as a trial for the Prix du Jockey Club. The last horse to win both races was Saonois in 2012. The 2002 winner "Diaghilev" was later exported to Hong Kong and renamed "River Dancer". <br> <br> Prix La Force The Prix La Force is a Group 3 flat horse race in France open to three-year-old thoroughbreds. It is run over a distance of 2,000 metres (about 1¼ miles) at Longchamp in April. The event is named in memory of the Duc de La Force, Bertrand Nompar de Caumont (1840–1909), a member of the Société d'Encouragement. It was established