Sinndar (27 February 1997 – 26 November 2018) was an Irish Thoroughbred racehorse and sire. In a racing career that lasted from September 1999 until October 2000, he ran eight times and won seven races. He was notable for his unique achievement in winning The Derby, Irish Derby Stakes and Prix de l'Arc de Triomphe in the same year. Background Sinndar, a dark-coated bay horse with a white stripe and white hind feet, was bred by his owner the Aga Khan in Ireland. He was sired by Grand Lodge out of the mare Sinntara. Apart from Sinndar, Grand Lodge (winner of the Dewhurst Stakes and the St James's Palace Stakes) sired the winners of over six hundred races including Grandera, Indian Lodge (Prix du Moulin de Longchamp, Prix de la Forêt) and Queens Logic (undefeated two-year-old champion). Sinntara was a staying Listed race winner, descended from a highly successful family which had been established by Marcel Boussac. As a descendant of the broodmare Tourzima, Sinntara was from the same branch of Thoroughbred Family 13-c which produced Darshaan, Acamas (Prix du Jockey Club), Akarad (Grand Prix de Saint-Cloud) and Akiyda (Prix de l'Arc de Triomphe). His pedigree was seen as combining speed on his sire's side with stamina from his dam. Like many of his owner's horses, he was sent into training with John Oxx near the Curragh, County Kildare, Ireland. Sinndar was ridden in all his races by the stable jockey, Johnny Murtagh. Racing career 1999: two-year-old season Sinndar did not appear on the racecourse until the September of his two-year-old season when he ran in a maiden race at his local course, the Curragh. Starting the Evens favourite, he took the lead in the final furlong and won "comfortably" by one and a half lengths from Rainbow And Gold, with the future Melbourne Cup winner Media Puzzle a neck away in third place. Only two weeks after his debut, having never previously run in a Conditions race, Sinndar was sent to contest Ireland's most important two-year-old race, the National Stakes over the same course and distance. He was regarded as a serious candidate, starting at odds of 7/1, but the overwhelming favourite was the Aidan O'Brien-trained Bernstein, who started at 4/11. Bernstein led from the start, and went clear of his opponents, but suddenly weakened inside the final furlong and was passed by the 50/1 outsider Murawwi. Sinndar, who