Traditionally Earl Grey was a blend of Chinese and Indian teas scented with the oil from the citrus bergamot fruit - a sort of orange.
The stories of Earl Grey are numerous. One such tale tells how a British diplomat on a mission to China saved the life of a Mandarin and as a gift of gratitude was given the recipe for this flavored tea. This diplomat upon his return to Britain presented the tea to the Prime Minister of the day, Earl Grey. Another story says it was the Prime Minister himself who saved the Mandarin. In any event it was the Prime Minister of England (1830-1834) Earl Grey who made this tea fashionable.