The Grey Gatsby stormed to victory in French racing's premier Classic, the Prix du Jockey Club at Chantilly.
Trained in North Yorkshire by Kevin Ryan and ridden by Ryan Moore, the colt finished three lengths clear of Shamkiyr and Prince Gibraltar.
The Dante Stakes winner is the first British-trained victor of the French Derby since 2005, and the Ryan team's first Classic success.
"We always thought he was a good horse," said Ryan.
"I don't think he got the credit he deserved after the Dante Stakes."