Ruler the World reigns in the Derby

Ryan Moore wins the Derby on Ruler of the World in Surrey, southern England, on June 1, 2013. Ruler of the World gave trainer Aidan O'Brien his fourth winner in the Epsom Derby

Ruler of the World gave trainer Aidan O'Brien his fourth winner in the Epsom Derby on Saturday.

The 7/1 shot - the first horse since Commander in Chief in 1993 to land the blue riband of the turf without running as a two-year-old - came home under Ryan Moore to hold off the fast finishing 14/1 chance Libertarian by 1 1/2 lengths while Galileo Rock was third at 25/1 a further head behind.

Hot favourite Dawn Approach was never looking comfortable and although he hit the front six furlongs from home he was quickly passed and finished last.

His performance dashed trainer Jim Bolger's hopes of him becoming the 38th horse to complete the English 2000 Guineas and Derby double.

"He was fine for 10 strides and then all hope was gone," said Bolger.

"He will not run over 1 1/2 miles again," said a shattered looking Bolger.

The favourite's jockey Kevin Manning, who teamed up with Bolger to land the 2008 Derby with New Approach, was similarly devastated.

"I was a passenger and he took me completely by surprise, he said.

"He got a bump but when I say a bump it just got tight, normal racing, and for whatever reason he just lit up and it was all over."

Moore, who also won the Derby in 2010 with Workforce, said that he thought his horse had hit the front too early when he passed stablemate Battle of Marengo.

"He's very green but he's got plenty of heart and showed it in what was a messy race," said Moore, whose mother, wife and two children were at the track to watch him.

"He quickened well and managed to see out the trip. It is a very special day and I am absolutely delighted," added the 29-year-old Englishman.

O'Brien, who had earlier won his sixth Coronation Cup in seven runnings when St Nicholas Abbey triumphed for the third year in a row, was typically understated in accepting the plaudits for training the winner.

"Well it's incredible but we are so lucky to be in the position that we are sent so many well bred horses," said the 43-year-old Irishman.

O'Brien, who succeeded the legendary Dr Vincent O'Brien (no relation) at Ballydoyle Stables when he retired 18 years ago, was at pains to explain why his son Joseph had deployed front running tactics on the stable's number one Battle of Marengo.

"Look, all the lads know their horses and they ride them as they feel best," said O'Brien, who saddled five of the 12 runners.

"The winner has won very impressively and is a very progressive type and will get better.

"It's an incredible day and I really love it when it works out for everybody like it has done today."

"I am very privileged."

John Magnier, the brainchild behind the Coolmore breeding operation that feeds O'Brien most of his horses, said there was a measure of luck in their extraordinary success rate in the race named the 'Blue Riband of the Turf' by 19th century British Prime Minister Benjamin Disraeli.

"Well there's a measure of luck in this and we are going through a lucky patch," said Magnier.

It was the 10th Derby winner sent out from the Ballydoyle Stables, six of them by Magnier's late father-in-law Vincent.

Asked how highly he rated Aidan O'Brien he was typically diplomatic.

"Well everyone knows where my father-in-law is rated on the greatest ever list, and Aidan, well, he isn't too bad either, is he!

"David Wachman (son-in-law of Magnier and who trained the third-placed Galileo Rock) is pretty useful too."

For the connections of Libertarian it was a memorable day as Elaine Burke came the closest ever to becoming the first woman trainer to win the Derby, after six previous attempts by rivals had fallen well short, on what was the centenary of suffragette Emily Davison dying from injuries sustained when she threw herself in front of King George V's runner in the Derby.

Burke, who trains in the North of England from where the last winner in the race came with Dante in 1945, has been in charge of the 65-horse stable since her husband Karl was disqualified from racing for a year in 2009 for providing information on a horse to a disgraced former owner.

"We can't be anything but delighted," said Karl, who suggested they might pay a supplementary entry fee for the Irish Derby on June 29.