Irish trainer Aidan O’Brien added another chapter to his already remarkable career when he trained the first three across the line in Europe’s premier race, the Group 1 Arc de Triomphe at Chantilly in France overnight.

Four-year-old mare Found recorded a career-highlight by winning the race, beating home King George winner and Cox Plate placegetter Highland Reel, with the Lloyd Williams-owned Order Of St George further back in third.

Despite his already astonishing list of achievements, O’Brien described the win as the greatest of his training career.

“It’s unbelievable,” O’Brien told Racing Post.

“I can’t describe it. You couldn’t even dream of that. How could you say anything is higher than this? It is the most difficult race. For that to happen it is incredible.

“I am so delighted for everyone. We were worried about the ground for Order Of St George but happy with the other two. It’s a massive team effort and I’m so priviledged to be a part of it and they were all by Galileo.”

After settling in a midfield position for jockey Ryan Moore, once Moore angled her through a gap in the straight she raced clear of the leaders to win by a length-and-three-quarters over Highland Reel, with Order Of St George a further one-and-a-half lengths away in third.

The Roger Varian-trained favourite Postponed could only manage fifth, with Demot Weld’s dual Derby winner Harzand ninth and Japanese galloper Makahiki fourteenth.