The Triennial Stakes, a three-year cycle of races, comprised a race for two-year-olds over 5 furlongs which was first contested in 1848 and which later evolved into the Chesham Stakes; a race for three-year-olds over 7 furlongs which was first run in 1849 and which later evolved into the Jersey Stakes, and the third leg, a race for four-year-olds over 2 miles. Horses would return each year to compete over the increasing distances, although the event was discontinued after the First World War.
Early history:- The First Leg of the First Triennial Stakes in 1848 saw the 2-year-old Elthiron defeat Borneo and Mounseer, while the next year, as 3-year-olds, Borneo got his revenge by winning the Second Leg of the First Triennial Stakes, beating Vatican and Elthiron. The Third, and final leg, of the First Triennial Stakes was held in 1850 and saw Vatican defeat Elthiron and Mounseer.