1839: three-year-old season Charles the Twelfth was unraced as a two-year-old and made his first appearance in July 1839 at
Aintree Racecourse. He was assigned a weight of six
stones and six
pounds in the Liverpool Tradesmen's Cup, an all-aged
handicap race over two miles and started at odds of
5/1 in a field of sixteen runners. Ridden by a lightweight
jockey named Francis, Charles the Twelfth disputed the lead with the five-year-old St Bennett before pulling clear in the closing stages to win easily. The
New Sporting Magazine described the performance as a "true St Leger running". On 17 September Charles the Twelfth was one of fourteen runners (from an original entry of 107) to contest the St Leger Stakes: he was ridden by his trainer's brother
Bill Scott and was made the 6/4 favourite ahead of the
Derby winner
Bloomsbury. The weather was cold and wet, leading to heavy ground and an unusually poor attendance. Bill Scott attempted to repeat the tactics he had employed on
Don John the previous year by taking the lead shortly after the start and setting a very fast pace. Most of the other horses were well-beaten before the turn into the straight, but as Charles the Twelfth approached the final furlong Euclid, ridden by Patrick Conolly, emerged as a serious challenger. Euclid briefly overtook Charles the Twelfth and appeared the likely winner but the favourite rallied and after a "head and head" struggle the two colts crossed the finishing line together. The judge declared a dead heat and the owners agreed to run a run-off. Both horses had appeared "much distressed" after the race which was run in 3 minutes 25 seconds. The early stages deciding heat, for which Euclid started a slight favourite, were run at a very slow pace, as both jockeys attempted to employ waiting tactics. Conolly eventually sent Euclid into the lead which he held until Charles the Twelfth made his challenge in the straight. As in the first race, the two colts raced together throughout the closing stages, but Bill Scott always appeared to have the upper hand and Charles the Twelfth won "rather cleverly" by a head. The time for the second heat was 3:45. Two days later Charles the Twelfth was matched against older horses, including the leading stayers
Bee's-wing and
Lanercost in the Doncaster Cup over two miles five
furlongs. Despite the facts that state of the ground had deteriorated further and that he was carrying a three-pound weight penalty he started the 11/8 favourite. Bee's-wing made the early running but faded in the straight. Lanercost looked the likely winner, but the three-year-old demonstrated "courage and energy of the first order" to take the lead in the last strides to win by a head.
1840: four-year-old season Before the start of the 1840 season, Charles the Twelfth was sold to the Scottish businessman Andrew Johnstone. Charles the Twelfth made his first appearance as a four-year-old in the Liverpool Tradesmen's Cup on 15 July. Carrying 125 pounds he sustained his first defeat as he finished third of the sixteen runners behind Lord Westminster's Sleight-of-hand. On the following afternoon he won the Grosvenor Stakes over one and three-quarter miles, beating Lord Westminster's three-year-old Maroon. Later that month Charles the Twelfth finished unplaced behind Beggarman in the
Goodwood Cup. In September, the colt returned to the scene of his classic victory but finished third to Bee's-wing and The Provost in the Doncaster Cup. Later that month he finished last of the four runners behind Gallipot in the Stewards' Cup at Liverpool. On his final appearance of a disappointing season, Charles the Twelfth had his first run in Scotland and was beaten by Lanercost in the Gold Cup at
Dumfries.
1841: five-year-old season Charles the Twelfth had his most successful season in 1841, when he won ten of his eleven races. He began his season in April at
Catterick Bridge Racecourse in Yorkshire where he won the local Gold Cup from two opponents. and at
Newcastle Racecourse in
Northumberland on 21 June he defeated Bee's-wing at weight-for-age in the Craven Stakes. In July he started favourite for the Liverpool Tradesmen's Cup despite carrying top weight, but finished unplaced behind Orelia, sustaining the only defeat of the year. Later that month he was one of ten horses to contest the
Gold Cup at Goodwood and carried top weight to victory from Hyllus. In August he won the Cleveland Cup at
Wolverhampton Racecourse at odds of 5/6 conceding weight to his three opponents. In the autumn of 1841, Charles the Twelfth competed in Scotland where he was unbeaten in his six races. At the Royal Caledonian Hunt meeting at
Stirling in October, he won a 50
sovereign race over two miles, and
walked over for the Challenge Whip and a Queen's Plate. Before the end of the month he walked over for another Queen's Plate at
Edinburgh and the Gold Cup at Dumfries before beating The Little Known and Master Syntax in the Roxburgh Gold Cup at
Kelso.
1842: six-year-old season Charles the Twelfth began his six-year-old season with another race against Bee's-wing and was beaten four lengths by the mare at weight-for age in the Gold Cup at Newcastle in June. At Goodwood in July Charles the Twelfth beat Hyllus by a neck in a £1000 match race over two miles and reappeared two days later for the Goodwood Cup. Ridden by
Jem Robinson and carrying top weight of 135 pounds, he won by two lengths from the three-year-old Policy to take the Cup for the second year in succession. At the Doncaster St Leger meeting Charles the Twelfth finished unplaced under top weight of 138 pounds in the Great Yorkshire Handicap and ran second to Bee's-wing in the Doncaster Cup. Later that month Charles the Twelfth ran at Kelso where he finished second to Cabrerea in the Roxburgh Gold Cup and was beaten when attempting to concede 40 pounds to the three-year-old Whistle Blinkie in a two and a half-mile handicap. On 7 October at the Royal Caledonian Hunt meeting at
Perth Racecourse Charles the Twelfth retained the Challenge Whip by beating Foxberry over two miles. Six days later he defeated Foxberry again to win his second Dumfries Gold Cup.
1843: seven-year-old season In June 1843 Charles the Twelfth started 5/2 favourite for the
Gold Vase at
Ascot Racecourse but finished unplaced behind the three-year-old Gorhambury. Later that month at Newcastle he recorded his last win when he won the Craven Stakes over one mile, beating the four-year-old Agreeable but then finished unplaced in the Newcastle Gold Cup. In July Charles the Twelfth carried top weight of 135 pounds in the Goodwood Cup: he started the 9/2 third favourite, but finished unplaced behind Hyllus. Charles the Twelfth returned to Doncaster for his final race in which he finished second to
Alice Hawthorn in the Doncaster Cup. ==Stud record==