Frankel has won all 14 of his races, after coming first in his final race at Ascot today.
Horse racing history could set to be made tomorrow as Frankel aims to retire undefeated.
Victory for Newmarket-trained Frankel
A son of the great Newmarket racehorse Frankel - together with his dam Crystal Gaze - has sold for £1,150,000 at auction.
He was bought by MV Magnier, son of Irish thoroughbred stud owner John Magnier, at the sale at Kensington Palace.
Frankel's foal goes up for auction in just over an hour.
Together with his mother, Crystal Gaze, who is expecting a second foal by the undefeated Newmarket racehorse, he could fetch more than £1m at the auction at Kensington Palace.
Henry Beeby, chief executive at auctioneers Goffs, said: "Frankel was the greatest racehorse we had ever seen. He was undefeated. He was spectacular. And he was an absolute star.
"It's a bit like Usain Bolt turning up at stud."
Click below to hear more from Henry Beeby.
The son of Newmarket racehorse Frankel is expected to sell for millions today when it is auctioned in London.
The colt will be the first offspring of the champion to come under the hammer and will be sold along with his dam, Crystal Gaze, who is also expecting a second foal by Frankel next year.
Crystal Gaze has already produced the classy sprinter Spirit Quartz as well as Saturday's Epsom Dash winner Caspian Prince and the pair are expected to sell for a seven-figure sum.
The colt's owner and manager, David Redvers, said: "He is a very handsome colt with huge presence and great action. He has what I would call a typical Frankel temperament in that he knows he is special and really owns the show.
"At this stage he looks like a speedy type, which is no surprise given his mother has bred some excellent sprint winners."
In 2012, Frankel retired to stud in Newmarket after being unbeaten in 14 races.
Last December, a five-year-old mare who was in foal to the famous racehorse sold for four million guineas.
Philip Mitchell, general manager at Juddmonte where Frankel stands, said: "The first foal by Frankel, the world's greatest racehorse, to be sold at public auction together with his dam who is back in foal to Frankel, is a unique opportunity and is most definitely the complete Frankel package."
He's been phenomenal on race courses across the country, but can Frankel become a worldwide success as a stallion?
The four year old colt retired to stud near Newmarket in Suffolk earlier this month. Donovan Blake reports
Frankel made his first post-retirement public appearance.
Of those selected to meet Frankel 33 have either won a group/grade 1 race or produced a winner of that status.
Frankel's final breeding programme for his first season at stud is still being finalised but his stallion duties will take place from February to June 2013.
Frankel has made his first public appearance since retirement.
The four-year-old who won all of his 14 races, will be visited by a host of mares during his first season as a stallion, some from as far as the USA, Japan and across Europe.
Racing superstar Frankel made his first public appearance since retiring to stud at Banstead Manor near Newmarket today.
The world's highest-rated racehorse Frankel makes his first outing as a stud today following his final victory at Ascot last month.
He retired to Newmarket after winning all 14 of his races. Breeders wanting foals from him will have to pay a stud fee of a hundred and twenty five thousand pounds.
The Newmarket-based racehorse Frankel has been named Cartier's Horse of the Year. It's the second year running he's won the prestigious title.
The 4-year-old bowed out of competitive racing last month with an unblemished record of 14 wins.
Frankel the four year old colt trained at Henry Cecil's stable in Newmarket stormed past the rest of the field at Ascot to win the Champion Stakes with millions watching around the world.
His unbeaten record plus the manner of his wins has resulted in speculation that not only is Frankel the greatest racehorse ever but that his stud value could now be worth over £100m.
Teddy Grimthorpe, Racing Manager for Frankel's owner Prince Khalid Abdullah explains how the wonder horse is settling in to his new life after racing.