Last year's French Derby winner Vision d'Etat won the Prince of Wales's Stakes at Ascot, the most valuable prize on offer on day two of the Royal meeting.
Trained in France by Eric Libaud and ridden by Olivier Peslier, the four-year-old came up the inside from last place to the land the 1m 2f race.
The 4-1 shot consigned Sir Michael Stoute's Tartan Bearer, the 6-4 favourite, to second place.
The third horse home, Never on Sunday, was also trained in France.
Libaud said afterwards: "Of all the winners I've had in the world this is the best one.
"I knew it was going to being to be difficult from last place but I could see the horse was going well and Olivier had told me the straight at Ascot is long, so I was quietly confident."
Coral and Ladbrokes trimmed Libaud's Prix de l'Arc de Triomphe hope into 12-1 for the big autumn race in Paris.
Libaud commented: "The Arc was always going to be his target this year and that is where he will go. He will have a break first and then go for a prep race in the Prix Foy.
"He is a better horse this year and has grown into himself. The crop this year doesn't look as good and he must go to the Arc with a very good chance."
Earlier, Spacious and Heaven Sent had given the Cheveley Park Stud a famous one-two in the Windsor Forest Stakes.
The duo had the race to themselves in the final furlong as they pulled clear of the opposition.
And it was Spacious (10-1), ridden by Johnny Murtagh and trained by James Fanshawe, who came out on top by a length from last year's runner-up Heaven Sent.
US raider Jealous Again sprinted away superbly to win the Queen Mary Stakes
In the first race of the day, Ouqbagave Sheikh Hamdan Al Maktoum back-to-back Jersey Stakes victories with a narrow verdict over Deposer in the opener on day two of Royal Ascot.
The 12-1 shot was ridden by Tadhg O'Shea, who hit the winning post with a fast finish for his first winner at the Royal meeting.
The biggest handicap of the day, the Royal Hunt Cup, went toForgotten Voice. The 4-1 Jeremy Noseda-trained favourite scored under Johnny Murtagh to give the jockey his third success of the week.
And a monstrous gamble was landed in the Queen Mary Stakes, a five-furlong dash for two-year-old fillies. Jealous Again gave American trainer Wesley Ward, who again had John Velazquez on board, a second win in two days.
Jealous Again started the race priced 13-2, having halved in value during the day, and she burst out of the stalls to beat off the opposition within seconds.
Wednesday's final race went to Jamie Spencer, who produced a perfect ride to land the Sandringham Handicap onMoneycantbuymelove. The 9-2 favourite was trained by Michael Bell.