2009 Prix de l'Arc de Triomphe  The 2009 Prix de l'Arc de Triomphe was a horse race held at Longchamp on Sunday 4 October 2009. It was the 88th running of the Prix de l'Arc de Triomphe. The winner was Sea the Stars, a three-year-old colt trained in Ireland by John Oxx. The winning jockey was Michael Kinane. Sea the Stars became the first horse to win the 2,000 Guineas, the Epsom Derby and the Prix de l'Arc de Triomphe. It was his sixth consecutive Group 1 victory. Further details of the winner, Sea the Stars.