Mr Dinos was the first English Royal-Oak win since the 1994 victory of Barry Hills' Moonax.
Paul Cole's Mr Dinos, just fifth in the St. Leger, was the star of the show in the French equivalent, the 1 7/8-mile Prix Royal-Oak, at Longchamp on Sunday.The 3-year-old led a one-two British effort with John Gosden's Sulk, finishing in second, beaten 2 1/2 lengths.Morozov provided the best finish of the French in third, but was demoted to sixth after a stewards' inquiry found Andre Fabre's runner guilty of hampering fifth-place Terrazzo. Clety, ridden by Breeders' Cup Mile winner Thierry Thulliez, was placed third.Mr Dinos won for the second time in France. He captured a Group III at Vichy in July.He led from the start under Dominique Boeuf. The heavy sod was ideal for Mr Dinos, who reserved his early speed for a strong finish.Richard Gibson's Cut Quartz, third in the Prix Cadran on Arc weekend, was last of the seven runners this time.