Cirrus des Aigles won the feature Qipco Champions Stakes at Royal Ascot, holding off the 7-4 favourite So You Think this afternoon.
The French horse just came through in the £1.3m race during the inaugural British Champions Day.
Cirrus des Aigles' Trainer Corine Barande-Barbe said: "This means a lot because I always thought he was very good.
"To win a Group One against the best horses in England is fantastic."
The French horse's run also set a new course record over 10 furlongs.
"This is the best day I've had in racing. Thank you to all the British people who have welcomed us," Barande-Barbe added.
Earlier in the day revered colt Frankel maintained his unbeaten record, easing to victory in the Queen Elizabeth II Stakes.