Stradivarius is a seven-year-old chestnut stallion who was bred and is owned by Bjorn Nielsen.
Most famously associated with the jockey Frankie Dettori, Stradivarius has won four successive Goodwood Cups as well as the Ascot Gold Cup on three occasions. In recognition of these feats, he won the Cartier Champion Stayer award in 2018, 2019 and 2020.
Sent into training at John Gosden's Newmarket stables, Stradivarius' sire is Sea The Stars, who won the 2000 Guineas, Epsom Derby and Prix de l'Arc de Triomphe in 2009.
Stradivarius won his maiden race at the third attempt - a one-mile maiden at Newcastle for which he was the evens favourite.
This was on November 7, 2016, and followed a fifth-place finish at Nottingham and a fourth-place finish at Newmarket during October. Dettori's partnership with Stradivarius began in the race at the Suffolk track.
With a modest two-year-old season behind him, Stradivarius improved significantly in 2017, winning three of the six races in which he ran, and placing in the others (with one second and two thirds).
He claimed the Group Two Queen's Vase at Royal Ascot on June 23 with Andrea Atzeni on board, overcoming interference in the straight to win by a neck over Count Octave.
Stradivarius and Atzeni stepped up again later in the year, winning the Group One Goodwood Cup for the first time. Ridden as the 6/1 second favourite, he overcame Big Orange, who had won the previous two editions of the race, by one-and-three-quarter lengths.
It was an impressive victory for the horse, who stayed on strongly after passing Big Orange while approaching the final furlong.
Dettori's most impressive victory in 2018 though came at Royal Ascot, where he guided Stradivarius to a three-quarter length win over Vazirabad in the Gold Cup.
Stradivarius was the 7/4 joint favourite with Order of St George in this race and he didn't disappoint, taking the lead from Torcedor a furlong out and holding on strongly.
After the race, Dettori said: "He was a lion, he fought everything off. The crowd lifted him."
He won the Goodwood Cup for the third successive year, beating Dee Ex Bee by a neck. In doing so, he emulated Double Trigger by becoming only the second horse ever to win the Goodwood Cup three times.
The race shouldn't have been this close, with Dettori celebrating prematurely after overtaking Dee Ex Bee as they approached the final furlong. His rival rallied and nearly pipped him at the post.
A month earlier, Stradivarius had successfully retained the Gold Cup at Ascot, despite Gosden's concerns that the ground was too soft.
Dee Ex Bee was his main rival once again, with Stradivarius winning by a length. Indeed, Dee Ex Bee was Stradivarius' main challenger throughout 2019, as the pair also ran in the Lonsdale Cup later that year, with Dee Ex Bee again finishing second to Stradivarius.
The 2020 season was more mixed for Stradivarius, but there were significant highlights.
He won his third straight Gold Cup, becoming only the third horse after Sagaro and Yeats to do so, when beating Nayef Road by 10 lengths. The rivalry was resumed at Goodwood the following month, where Stradivarius won a record fourth Goodwood Cup over the same horse by a single length.
As Stradivarius attempted to win a record fourth Ascot Gold Cup, he entered the race having won his one and only outing of 2021 so far. That was the Group Three Longines Sagaro Stakes at Ascot back in April, a trial for the Gold Cup. However, he disappointed at Ascot in June, finishing fourth behind 13/2 shot Subjectivist, Princess Zoe and Spanish Mission in the Gold Cup.
Stradivarius is trained by John and Thady Gosden, who have an exceptional track record in racing.
John Gosden has trained over 3,000 winners around the world and has won over 100 Group One races. In 2014, he became the only trainer in history to win the Cartier Awards for Cartier Champion Three-year-old Colt, Cartier Champion Three-year-old Filly and Cartier Horse of the Year in the same year.
Stradivarius' breeder is Bjorn Nielsen, who has a number of other horses under his care. These include Gloria Mundi and Flaunt, who are also trained by John and Thady Gosden.
Nielsen has a 23% win percentage in British Flat racing over the last five years and a 33% win percentage in 2021.
Frankie Dettori is a well-known jockey who has ridden over 3,000 winners in Britain and has been Champion Jockey on three occasions.
The Italian has won many of the most prestigious races in British racing including the 1000 Guineas four times, the 2000 Guineas three times and the Ascot Gold Cup on eight occasions. He has also won the Coronation Cup, the Lockinge Stakes, the Oaks, the Queen Anne Stakes, the Queen Elizabeth II Stakes and the Derby on more than one occasion.
Sea the Stars is one of the greatest horses of all-time, having won the 2000 Guineas, the Epsom Derby and the Eclipse Stakes in 2009. In doing so, the Irish Thoroughbred became the first horse to achieve the treble in 20 years.
In the same year, he also claimed the Juddmonte International Stakes, the Irish Champion Stakes and the Prix de l'Arc de Triomphe. He is half-brother to Epsom Derby winner Galileo.
Private Life had a mixed record in her racing career, winning two races of the eight she entered. She also claimed one second-place and two third-place finishes.
Racing exclusively in France, she won the Prix de la Sorbonne at Longchamp in August 1999 and the Prix de la Flandrie at the same racetrack the following June.