Page "Epsom Derby" Paragraph 5
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Wikipedia
A new race was planned, and it was decided that it should be named after either the host of the party, the 12th Earl of Derby, or one of his guests, Sir Charles Bunbury.
According to legend the decision was made by the toss of a coin, but it is probable that Bunbury, the Steward of the Jockey Club, deferred to his host.
It was won by Diomed, a colt owned by Sir Charles Bunbury, who collected prize money of £ 1, 065 15s.
The first four runnings were contested over 1 mile, but this was amended to the current distance of 1½ miles in 1784.
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2.226 seconds.