The colt was sent into training with Robert Robson, known as the "Emperor of Trainers"[2] who produced the winners of thirty-four Classic races from his base at Newmarket, Suffolk.

He then collected a further 1,500 guineas for his owner three days later without having to race as his rivals were withdrawn from the Dinner Stakes, and he was allowed to walk over to claim the prize.

When four of his opponents withdrew, Colonel Udney agreed to divide the prize money with Lord Exeter, the owner of Emilius's only remaining rival.

When Buckle finally used his whip on the favourite, Emilius "sprung forward like a dart" and won by a length from Tancred with the rest of the runners too far behind to be placed by the judge.

On his final start of the year Emilius beat Cinder by three lengths in a 1,000 guinea Sweepstakes on 13 October to complete an unbeaten season.

[10] Later that month he faced a much more competitive match in which he attempted to give seven pounds to the Ascot Gold Cup winner Bizarre and was beaten for the £300 prize.

[6] When Thornhill died in 1844 Emilius, who was then in poor condition, was bought by Lord George Bentinck who rested the stallion and had him steadily restored to health.

[12] Bentinck then leased Emilius to R. M. Jaques to stand as a stallion at Easby Abbey in Yorkshire where he covered mares for two further years at a fee of 16 guineas.