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
St Nicholas, Blakeney scheduled monument and Grade II listed ruins of a medieval building in the salt marshes north of the present town described as "Blakeney Chapel", but, despite the name, it now seems likely that this was a domestic dwelling rather than a religious edifice. Another possible chapel site east of the Glaven was shown on an 1835 map, but there is no documentation to support that identification. The nearby Carmelite friary had its own church by 1321, built on land donated by tenants of William de Roos, "that the Carmelite friars, by the King's licence, and that of Sir William Roos,