During his racing career he was owned by his breeder Leopold de Rothschild[4] and trained by Alfred Hayhoe at the Palace House stable in Newmarket, Suffolk.

Doricles was one of the first crop of foals sired by Florizel II, a high class racehorse and a brother to the Derby winners Persimmon and Diamond Jubilee.

Doricles' dam Rosalie also produced St Rosalia, an influential broodmare whose descendants have included Kelso, Alysheba, Farma Way, Bel Bolide and Quiet Reflection.

[12] A week before running in the St Leger the colt won again, taking the Champion Breeders' Biennial Foal Stakes at Derby Racecourse by half a length at odds of 4/7.

[13] On 11 September Doricles, ridden by Kempton Cannon, started a 40/1 outsider in a thirteen-runner field for the 126th running of the St Leger Stakes over 14+1⁄2 furlongs at Doncaster Racecourse.

Volodyovski started the 5/6 favourite while the other runners included Fortunatus, Veronese (Prince of Wales's Stakes), Jacobite (Grand Prix de Deauville), Aida and the Irish-bred Revenue.

After settling behind leaders for most of the way, Doricles moved into contention in the straight, gained the advantage approaching the final furlong, and fought off the challenge of Volodyovski to win by a neck.