Heart of Darkness (11 February 1988 – 25 May 2011) was a British-bred Thoroughbred racehorse and sire. He showed by far his best form a juvenile in 1990 when he won two of his three races including the Washington Singer Stakes and the National Stakes before his career was interrupted by a serious leg injury. He failed to win again for two years before taking two minor races in the autumn of 1992. He later stood as a breeding stallion in Australia with limited success. Background Heart of Darkness was a brown horse bred in England by his owner Paul Mellon. Like many of Mellon's European runners, he was trained throughout his racing career by Ian Balding at Kingsclere in Hampshire. He was one of the best flat horses sired by Mellon's stallion Glint of Gold who won six Group 1 races as well as finishing second in the Epsom Derby. Heart of Darkness was the first foal of his dam Land of Ivory, a successful racemare who won three races and was placed in both the Lupe Stakes and the Prix Cléopâtre. As a granddaughter of the American broodmare Natashka (foaled 1963), she was closely related to Margarula, Questing, Elusive Quality and Dark Lomond. Racing career 1990: two-year-old season Heart of Darkness began his career in a maiden race over six furlongs at Goodwood Racecourse on 4 August in which he started at odds of 9/1 and finished fourth of the eight runners, six and a quarter lengths behind the winner Majlood. Thirteen days later he was stepped up in class and distance for the Listed Washington Singer Stakes over seven furlongs at Newbury in which he was ridden, as on his debut by Steve Cauthen. Starting the 11/2 outsider of the four runners, he raced at the rear of the field before accelerating into the lead inside the final furlong and winning by one and a half lengths from the Barry Hills-trained Caerdydd. The Irish jockey Pat Shanahan took the ride when the colt was sent to Ireland to contest the Group 1 National Stakes over seven furlongs at the Curragh on 8 September. He was made the 7/4 favourite ahead of Malvernico, a Jim Bolger-trained colt who had won both the Curragh Stakes and the Anglesey Stakes. The other six runners included Caerdydd, Poets Dream (from the Vincent O'Brien stable), Prodigal Blues (third in the Chesham Stakes)