Sir Percy dam Percy's Lass won the Group 3 September Stakes in 1988 (and subsequently died of colic when Sir Percy was a foal. Sir Percy was the last of her offspring) and his damsire Blakeney won the Epsom Derby himself in 1969. Sir Percy was named after Sir Percy Blakeney, the hero of the novel "The Scarlet Pimpernel". In November 2003 Sir Percy was sent as a weanling to the Tattersalls sales. He was bought for 20,000 guineas by Will Edmeades bloodstock, acting on behalf of Anthony Pakenham. Pakenham bought the colt as compensation for losing a National Hunt Horse. Sir
Sir Percy first Group race success when beating Cool Creek by a neck in the Vintage Stakes at Goodwood. Sir Percy was then rested until returning in Britain's most prestigious two-year-old race, the Dewhurst Stakes, on 15 October. He was held up in the early stages before producing a powerful late run to take the lead inside the final furlong and win by a neck from the odds-onn favourite Horatio Nelson. Sir Percy made his seasonal debut in the 2000 Guineas on 6 May. He started 4/1 second favourite in a field of fourteen runners. He tracked the leaders for most of