 Princequillo won several important races at longer distances.He broke the Saratoga Race Course record for 1¾ miles and his performances were such that he is considered to be the best long-distance runner, with the exception of Kelso, in American racing history.Retired after his four-year-old racing season, Princequillo was purchased by Arthur B. Hancock and sent to the Hancock family's Ellerslie Stud in Albemarle County, Virginia and later to their Claiborne Farm near Paris, Kentucky.