Last year’s champion juvenile had earned high praise leading into the Classic season but there were doubts after he faded badly in the 2,000 Guineas last month.

Yet jockey Ryan Moore expertly guided the Irish-trained colt through the field at Epsom before bursting clear to earn his fourth win in the race by two and three-quarter lengths.

Ambiente Friendly (9-2) was second while O’Brien’s Los Angeles (6-1) was third, with 25-1 shot Deira Mile finishing fourth.

It was a second consecutive victory in the Derby for O’Brien, with City of Troy, like Auguste Rodin last year, bouncing back in startling fashion after disappointment in the 2,000 Guineas at Newmarket.