"Prince Khalid bin Abdullah was foremost a man of extraordinary class, and the excellence he achieved in Thoroughbred racing and breeding globally will continue to influence the breed for generations".
Abdullah's silks were carried to victory by numerous greatest racehorses of the 20th and 21st century.
But arguably his most celebrated champion was Frankel.
Others included Dancing Brave, Zafonic and Commander in Chief. He won the Arc, 2000 Guineas and Eclipse while he was narrowly beaten in the Derby at Epsom under a controversial Greville Starkey ride.
Over the last 40 years his pink, green and white colours have been carried to victory by some of the sport's best horses, including Frankel and Enable. Incredibly he bred 102 of those top level performers.
Juddmonte chief executive Douglas Erskine Crum, chief executive of his Juddmonte breeding operation, paid tribute by telling the BBC: "Prince Khalid will always be remembered as a quiet, dignified, benevolent family man, whose horses spoke for him", he said.
Prince Khalid's most recent superstar was Enable, whose wins included the Prix de l'Arc de Triomphe in 2017 and "18 and the Breeders" Cup Turf in '18.
Frankie Dettori told the Racing Post "It's very sad news".