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On Sunday, Paris will host the richest horse race in Europe, a sporting event often considered to be one of the most glamorous in the world - the Prix de L'Arc de Triomphe. There is special significance this year because one horse in the field will try to win it for the third time, a feat never previously achieved. Treve is the name of the mare - and her story has become critical to horse racing in France as it tries to win back its audience. Joe Wilson reports from France. Music: The song ‘Fly Away Treve’ is a production of Turfcom in France Photo: Jockey Thierry Jarnet rides his horse Treve during the Qatar Prix de l'Arc de Triomphe, in 2013 at Longchamp Paris. (Credit: FRED DUFOUR/AFP/Getty Images)