Trainer Jim Bolger improved his incredible recent record in the Dewhurst Stakes as Parish Hall sprang a 20-1 surprise at Newmarket.
Having previously won the race with Teofilo, New Approach and Intense Focus, Bolger enjoyed a fourth triumph.
Kevin Manning had the colt prominent throughout on the rails and, despite seemingly being one of the first under pressure, he kept on galloping.
Jockey Frankie Dettori won the Cesarewitch on Never Can Tell.
Most Improved and Bronterre were challenging for victory in the Dewhurst Stakes inside the final furlong, but Power took second - half a length behind the winner - after a sluggish start.
Parish Hall had disappointed in the Phoenix Stakes but was only narrowly beaten into second in the Futurity Stakes by Dragon Pulse.
Given Dragon Pulse had chased home Power in the National Stakes, Bolger and Manning were quietly confident of a bold show.
Meanwhile, Dettori produced a magnificent piece of front-running riding from the worst of the draw to win the Cesarewitch.
The former champion jockey won the prestigious race for the first time and provided trainer Jamie Osborne with one of the biggest wins of his training career.
Drawn widest of all in stall 36, Dettori was on his own down the centre of the track for most of the race.
Top-weight Mount Athos loomed menacingly but the weight told and he faded into fifth.
Mark Johnston's Colour Vision was the main challenger inside the final furlong but eventually was caught by Ermyn Lodge for second, a length and a half adrift of the winner.
Dettori said: "Twenty-five years of trying and I've finally broken the hoodoo! She's a front-runner but to cut the corner was an advantage.
"Full credit to Jamie, she's really tried for me."
Osborne added: "With her style of running, it probably wasn't as bad a draw as everyone thought.
"Frankie said to me 'do me a favour, don't give me any instructions'. She likes to bowl along in front so it was always going to be a pretty straightforward plan really.
"I just said go out and give me the ride of the season and he has. She's not very pretty or very big but she just tries. It's lovely to be part of it."