Second colours of the Aga Khan, carried by Kahyasi in the Derby.
|Sire||Ile de Bourbon|
|Foaled||2 April 1985|
|Breeder||HH Aga Khan IV|
|Owner||HH Aga Khan IV|
|Lingfield Derby Trial (1988)
Epsom Derby (1988)
Irish Derby (1988)
|Last updated on 16 June 2008|
Kahyasi (2 April 1985 – 2008) was an Irish-bred and British-trained Thoroughbred racehorse. He won the first five races of his seven-race career, including the Epsom Derby and the Irish Derby as a three-year-old in 1988.
Kahyasi was a small, dark-coated bay horse bred by his owner HH Aga Khan IV at his stud in Ireland. His sire, Ile de Bourbon, was best known for his win in the 1978 King George VI and Queen Elizabeth Stakes. Kahyasi was trained by Luca Cumani at his Bedford House stable Newmarket, Suffolk during his racing career and was ridden in all his races by Ray Cochrane.
Kayasi won the Soham House Stakes at Newmarket in his only race as a two-year-old in 1987. Although the race was a minor one, Ray Cochrane later explained that he and Cumani were "excited" about the colt, and considered him a Derby prospect.
Kahyasi made his three-year-old debut in the Harvester Stakes at Sandown in April. He started the 2/5 favourite and won by two lengths from his five opponents, to whom he was conceding five pounds. On his next start two weeks later he was moved up to Group Three class for the Lingfield Derby Trial. He again started odds-on favourite and won by two lengths from Insan.
At Epsom on 1 June, Kahyasi started 11/1 fifth favourite in a field of fourteen for the 209th running of the Epsom Derby. He carried the Aga Khan's chocolate and green second colours, with the first colours being worn by Walter Swinburn on the 2000 Guineas winner Doyoun. Kahyasi broke slowly and was held up by Cochrane in the early stages before making steady progress in the straight. He was switched to the outside to take the lead a furlong from the finish and ran on well to win by one and a half lengths from Glacial Storm, with Doyoun third. At the end of the month, Kahyasi started odds-on favourite for the Irish Derby at the Curragh. He appeared to be struggling at half way and was still well behind entering the straight. Under a strong ride from Cochrane, he caught the long-time leader Insan in the last strides to win by a short head. It was subsequently revealed that he had been struck into by another horse during the race and had won despite sustaining a leg injury.
Kahyasi prepared for a run in the Prix de l'Arc de Triomphe by contesting the Prix Niel at Longchamp in September. He suffered the first defeat of his career as he was beaten a neck by the Grand Prix de Paris winner Fijar Tango. In the Arc three weeks later, Kahyasi finished sixth of the twenty-four runners, beaten just over two lengths by Tony Bin.
Kahyasi undertook stud duties at the Aga's Ballymany Stud in Ireland. He was later moved to stand at the Haras de Bonneval in Normandy until June 2008 when he was put down at the age of 23 after being diagnosed as suffering from a tumour. On hearing of Kahyasi's death, Cumani paid tribute to his Derby winner, calling him "a great horse and a great friend."
At stud, he sired over 55 graded stakes winners including.
- Darasin, Goodwood Cup G2
- Enzeli, Ascot Gold Cup G1, Doncaster Cup G2
- Hasili, outstanding broodmare
- Karasi, Geelong Cup
- Khalkevi, Grand Prix de Paris G1
- Vereva, Prix de Diane G1
- Zainta, Prix de Diane G1
- Nazirali, San Luis Obispo Handicap (2002) G2 
Through his unraced daughter Zarkasha, Kahyasi is the damsire of the Prix de l'Arc de Triomphe winner Zarkava and the Triumph Hurdle winner Zarkandar. In 2008 before his death Kahyasi won the 2008 French broodmare sire title ahead of Sadler's Wells, Linamix and Kaldoun.
- "Kahyasi race record". Racing Post. 2 June 2011. Retrieved 28 December 2011.
- "Cochrane made the right Derby choice in 50-50 pick". Daily Mail. 29 May 2007. Retrieved 28 December 2011.
- "Harvester Stakes". Racing Post. 22 April 1988. Retrieved 28 December 2011.
- "Derby Trial". Racing Post. 7 May 1988. Retrieved 28 December 2011.
- "Kahyasi obituary". Thoroughbred internet. 16 June 2008. Retrieved 28 December 2011.
- "Epsom Derby". Racing Post. 1 June 1988. Retrieved 28 December 2011.
- "Irish Derby". Racing Post. 26 June 1988. Retrieved 28 December 2011.
- "Cumani pays tribute to 'a great horse' after Kahyasi dies aged 23". Racing Post. 15 June 2008. Retrieved 28 December 2011.
- "Prix Niel". Racing Post. 11 September 1988. Retrieved 28 December 2011.
- "Prix de l'Arc de Triomphe". Racing Post. 2 October 1988. Retrieved 28 December 2011.
- Whitelaw, Sarah (13 January 2009). "Gone, but not forgotten". Thoroughbred Internet. Retrieved 24 June 2013.
- "Kahyasi". Aga Khan Studs. Retrieved 28 December 2011.
- "ASB: Kahyasi". Studbook. Retrieved 28 December 2011.
- "Winners Sold". Aga Khan Studs. Retrieved 28 December 2011.
- "History". Aga Khan Studs. Retrieved 24 June 2013.
-  - Kahyasi's pedigree