- Golden Horn wins Prix de l'Arc de Triomphe
- Filly Treve finishes fourth in triple bid
- Frankie Dettori wins Arc for fourth time
- Richest horse race in Europe
(CNN)Frankie Dettori rode Golden Horn to a breathtaking victory in the Prix de l'Arc de Triomphe at Longchamp Sunday, denying wonder mare Treve a record third win.