The Aga Khan's Sinndar, recent winner of the Prix de l'Arc de Triomphe Lucien Barriere (Fr-I), has been retired to enter stud next year at his owner's Gilltown Stud in Ireland. According to a report by PA Sport in Sporting Life, the Grand Lodge colt will stand for IR£30,000.The Arc, in which the 3-year-old upset defending champion Montjeu, was the fifth consecutive win for the Irish-bred and his fourth career group I triumph. The winner of both the Vodafone Epsom Derby (Eng-I) and the Budweiser Irish Derby (Ire-I), Sinndar won the Arc off an eight-length triumph in the Prix Niel-Casino d'Enghien les Bains Barriere (Fr-II). As a juvenile, the bay colt won the Aga Khan Studs National Stakes (Ire-I) in his second career start and he retires with seven wins from eight career starts."I think this horse is one of the best I've ever seen," the Aga Khan told Sporting Life."Someone told me he is the first horse to win the (Epsom) Derby, the Irish Derby and the Arc -- I think he is an exceptional horse."A complete report on Sinndar's Arc and his breeding was published in the Oct. 7 issue of The Blood-Horse.