Twelve months after the procession of Camelot in the Racing Post Trophy, Aidan O'Brien unleashed another colt with immense potential when Kingsbarns ran out the winner of the final Group One of the season at Doncaster.

Having only made his debut 17 days earlier, the Galileo colt, bred by O'Brien's wife Annemarie, was a late entry to the race.

Some bookmakers introduced him into their betting at 8-1 but that did not last long and he was sent off the 15-8 favourite.

The result never looked in danger at any stage and Joseph O'Brien took it up over a furlong (200m) out before going away to win by a length and three-quarters.

Van Der Neer got up on the line to beat Steeler for second.

It was Aidan O'Brien's seventh win in the race and his enthusiasm for the colt was infectious.

"We're obviously delighted. He's only a baby coming here but he's got an unbelievable cruising speed," O'Brien said.

"He won his maiden on easy ground and we were intent on leaving him off for the season but we gave him one bit of work and after that he was very fresh.

"There was a big exam for this being sat and he passed it with flying colours and all his figures stacked up.

"All the boxes were ticked at home - his speed figures, his recovery, his visuals and everything we do at home.

"He'll have learned a lot. That was the first time he's been away from home.

"Joseph said he was stopping in front and pricking his ears, he took it up earlier than he wanted.

"He's very exciting."