1835: two-year-old season

Elis was one of the best British two-year-olds of 1835, winning five of his six races. Until 1913, there was no requirement for British racehorses to have official names,^[4] and the horse who later became known as Elis began his career as Mr. Greville's Brother to Stockport.^[5] He made his racing debut at the July meeting at Newmarket Racecourse where he was one of fourteen two-year-olds to contest the Chesterfield Stakes over the last half of the Bunbury Mile course. Ridden by Day, he started the 4/1 third favourite and won from William Chifney's brother to Glaucus, the winner of the July Stakes.^[6] On his next appearance, Elis (now officially named) was ridden by Nat Flatman in the Molecomb Stakes at Goodwood Racecourse on 30 July. Carrying top weight of 120 pounds, he started odds-on favourite and won by half a length from Skirmisher.^[7]

Elis was rested until the autumn, when he ran at Newmarket's Second October meeting, where Day took over again as his jockey. On 13 October he started second favourite behind Colonel Peel's colt Slane for the Clearwell Stakes. He won the five furlong race from the filly Marmalade, with Slane unplaced.^[8] Three days later, Elis sustained his only defeat of the season when he finished second by a length to the Duke of Grafton's colt Alumnus in the Prendergast Stakes. Two weeks later, Elis had two engagements at the Newmarket Houghton meeting. On 26 October he started 6/4 favourite for the Criterion Stakes under top weight of 120 pounds, and led from the start to win "cleverly" by half a length from Slane with Mr Wags in third place.^[9] Three days later he walked over for a sweepstakes over the Abington Mile, after the other nineteen horses entered were withdrawn by their owners.^[10]

1836: three-year-old season

Elis began his second season in the 2000 Guineas over the Rowley Mile course at Newmarket on 17 April. He started at odds of 5/2, but the 6/4 favourite was Lord Jersey's Riddlesworth Stakes winner Bay Middleton. Elis was beaten by a neck by Bay Middleton after a vigorously contested finish, with the pair finishing well clear of the other four runners. The New Sporting Magazine commented that "two faster or gamer horses have seldom been opposed to each other".^[11]

Elis had not been entered in The Derby and did not race again until the Goodwood meeting at the end of July. He started 1/2 favourite for the Drawing-room Stakes and won by three lengths from Magician and six other three-year-olds.^[12] Two days later he was matched against older horses in the Goodwood Cup and finished second to the four-year-old Hornsea, with the St Leger winner Rockingham among the unplaced runners. On the same afternoon he won the one-mile Racing Stakes from two opponents at odds of 1/10.^[13] On 10 August, Elis appeared at Lewes Racecourse in Sussex where he won the all-aged Lewes Stakes over one and a half miles from six opponents.^[14]

From as early as the autumn 1835, Elis had been regarded as a leading contender for the St Leger at Doncaster Racecourse in late September, but when the horse was still in Goodwood a week before the race his chances appeared remote. In the 1830s, the established way for a horse to travel to a racecourse was to walk there, usually at a very gentle pace to minimise the risk of injury, and the 250 mile journey from Goodwood to Doncaster could take up to three weeks. Despite the fact that it appeared impossible for Elis to run in the St Leger he continued to be supported in the betting, which led to considerable confusion until Bentinck's plans were revealed. A specially designed carriage or "caravan" had been constructed which could be drawn at high speed by a team of horses whose members could be replaced at regular intervals. Elis and a travelling companion named The Drummer were loaded into the padded interior of the caravan and were transported to Doncaster in less than three days: there was even time to pause and give the horses an exercise gallop at Lichfield Racecourse.^[15] The project had been kept secret to allow Bentinck and his confederates to back the horse at longer odds than would otherwise been available.^[16] On 20 September, Elis started at odds of 7/2 for the St Leger, with the John Scott-trained Scroggins being made the 6/4 favourite in what was considered an unusually strong field.^[17] Ridden as usual by John Day, Elis took the lead at half way and was never seriously challenged, winning easily from Scroggins, who got the better of a "neck and neck" struggle with Beeswing for second place.^[18] The connections of the winner were reported to have taken approximately £24,000 in winning bets.^[17]

Two weeks after his victory at Doncaster, Elis was back at Newmarket for a rematch with Bay Middleton at the First October meeting. The presence of the "extraordinary pair" of classic-winning colts in the Grand Duke Michael Stakes led to the other twenty-two horses being withdrawn by their owners.^[19] Elis was beaten a length by the 2/5 favourite,^[20] but gave Bay Middleton the hardest race of his career. Elis ended his season in a ten furlong sweepstakes at the Newmarket Houghton meeting on 3 November. He ran a dead heat with Mr Wags to whom he was conceding eight pounds, and the owners decided to divide the prize money rather than running a deciding heat.^[21]

1837: four-year-old season

Elis was kept in training as a four-year-old but made only one appearance. At the Newmarket Craven meeting on 12 April he ran a match race against Slane over the Ditch Mile course. He conceded seven pounds to his opponent and won at odds of 1/3 to claim a 300 Guinea prize.^[22]

Late in 1837, Bentinck bought Bay Middleton and sold Elis to Sidney Herbert. Elis had been scheduled to run a match over five furlongs against a filly named Vulture at Newmarket in October but did not appear for the race.^[23]