Ruler Of The World lived up to his name by winning the Epsom Derby in England on Saturday.
The unbeaten colt on only his third run, proved too strong for 11 rivals under jockey Ryan Moore. It was the fourth Derby win for Irish trainer Aidan O'Brien.
Ruler Of The World finished 1½ lengths ahead of Libertarian. Galileo Rock was third in the 234th running of the race.
Favourite Dawn Approach owned by Dubai ruler Sheikh Mohammed, came home last.
Ruler Of The World is the son of Galileo who provided O'Brien with his first Derby victory in 2001. He also won the event with High Chaparral in 2002 and Camelot last year.
It was Moore's second Derby triumph following victory on Workforce in 2010.
"He's still a baby," said Moore, who added that "if he continues to progress he could make up into quite a nice horse.
"I was there too early but he really toughed it out and showed a good attitude."
O'Brien said Ruler Of The World earned his name from his early days at the Ballydoyle stable in County Tipperary.
"I was afraid to run him as a two-year-old with a name like that," he said. "He has an unbelievable pedigree. But he earned his name from an early age - it speaks for itself."
The horse is owned by John Magnier, Michael Tabor and Derrick Smith.