Papineau came from off the pace to land the Gold Cup for the Godolphin team at Royal Ascot this afternoon.
Frankie Dettori settled the 5-1 second-favourite back in the field but steadily made headway to go past Westerner entering the final furlong.
The French raider had no answer to Papineau's finishing kick and had to settle for second, with Darasim staying on to take third in the premier stayers' contest.
Papineau missed the break slightly, along with Brian Boru, as Japan's Ingrandire took the initiative in the early stages of the two-and-a-half mile contest.
Mr Dinos, sent off the 5-4 favourite, was always up with the pace and Kieren Fallon took up the running entering the home straight and set sail for home.
But they were queuing up to take him on and he was soon passed by Westerner (13-2).
Dettori weaved his way through to take over in the final furlong, pulling clear to score by a length and a half, with Darasim (28-1) a further two and a half lengths away.
It was a fourth victory in the race for Godolphin following Classic Cliche and Kayf Tara (twice).