Sunday, 9 November 2025

“Bloodlines, Billionaires & Betrayal: The John Magnier & Aidan O’Brien Story”



Magnier was born in Fermoy, County Cork, the eldest son of Thomas Magnier (1909–1962) a County Cork landowner. His aunt Mary Elizabeth Hallinan married Rupert Watson, 3rd Baron Manton, Senior Steward of the Jockey Club 1982–1985.

 

Magnier received his formal education at Glenstal Abbey in County Limerick but had to leave school at 15 to take charge of the family estate near Fermoy after his father died.

 

Magnier later moved to County Tipperary, where he helped transform Coolmore Stud into a multi-million-euro international business. The business is headquartered in County Tipperary where a number of other stud farms are part of an extensive network which includes Longfield and Castlehyde studs. The operation also has branches in Versailles, Kentucky and at Jerrys Plains, New South Wales, Australia.

 

Magnier began his association with Coolmore in partnership with his father-in-law and champion racehorse trainer, Vincent O'Brien, and Vernon's Pools magnate, Robert Sangster. They developed successful racing horses and breeding stock, mainly by purchasing the progeny of the Canadian stallion Northern Dancer. Eventually, Magnier came to head the operation. His racing empire is nowadays powered by blue-blooded thoroughbreds trained at Ballydoyle by Aidan O'Brien, plus many others in the care of other trainers.

 

Champion sires to have stood at Coolmore include Sadler's Wells who was leading sire (by prizemoney won) in Great Britain and Ireland in 14 of the 15 years between 1990 and 2004, though his success in his later years was eclipsed by three other Coolmore stallions, namely Danehill and his own sons Galileo and Montjeu. Other notable Group 1 winners who have turned successfully to stud duties are Danehill Dancer, Giant's Causeway, and Epsom Derby winner High Chaparral.

 

Less successful at Coolmore was George Washington, winner of the 2,000 Guineas and Queen Elizabeth II Stakes in 2006. George Washington proved infertile, was returned to racing, and suffered a fatal breakdown in the 2007 Breeders' Cup Classic. George Washington was replaced at stud by another son of Danehill, Holy Roman Emperor, removed from training at the start of his three-year-old season. Eleven of the fifteen winners of The Derby between 1998 and 2012 were sired by Coolmore stallions (High Estate, Fairy King, Grand Lodge, Sadler's Wells (two), Danehill, Montjeu (four) and Galileo


Aidan Patrick O'Brien (born 16 October 1969 in County Wexford, Ireland) is an Irish horse racing trainer. Since 1996, he has been the private trainer at Ballydoyle Stables near Rosegreen in County Tipperary for John Magnier and his Coolmore Stud associates. He is widely acknowledged as one of the greatest horse racing trainers of all time.

 

Early and private life

Aidan O'Brien was one of six children of Denis O'Brien (died 1 December 2008) and his wife Stella (née Doyle). Denis was a farmer and small-scale horse trainer in the townland of Killegney, near Poulpeasty, in County Wexford, where Aidan grew up.

 

Aidan O'Brien attended Donard National School, located less than a mile from his parents' home. He subsequently attended secondary school at Good Counsel College, New Ross, also located in County Wexford. O'Brien is a member of the Pioneer Total Abstinence Association, meaning that he does not drink alcohol.

 

O'Brien first started working professionally with horses at P.J. Finn's racing stables at the Curragh, County Kildare, and then with Jim Bolger at Coolcullen, County Carlow.

 

Aidan O'Brien is married to Anne-Marie (née Crowley). Anne-Marie's father, Joe Crowley trained horses at Piltown, County Kilkenny, where his tenure was interrupted in quick succession by his daughter Anne-Marie (Champion National Hunt Trainer during her brief time at the helm), his son-in-law Aidan O'Brien (who took over from his wife in 1993 but moved on to Ballydoyle in 1996) and then another daughter, Frances Crowley (who moved on to train on the Curragh for some years). Joe then renewed his own training licence for some years before retiring.

 

 Aidan O'Brien at the 2012 Epsom Derby

Aidan O’Brien was champion Irish National Hunt trainer in the 1993/4 season and went on to lift the title for the next 5 consecutive seasons. His most successful horse during this time was the famed Istabraq. In 1996 he was approached by John Magnier to train at Ballydoyle. For a number of years he retained his Piltown yard.

 

O'Brien and Anne-Marie have four children, with Joseph, Sarah, Anastasia and Donnacha all jockeys. Joseph became apprenticed to his father and rode his first winner shortly after his sixteenth birthday, on Johann Zoffany at Leopardstown on 28 May 2009. In 2012 O'Brien and Joseph, 19, became the first father-son/trainer-jockey combination to win The Derby, with Camelot. As of 2024, Aidan O'Brien is the most successful Epsom Derby trainer of all time with 10 wins. (...)


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