Tea flavoured with bergamot to imitate the more expensive types of Chinese tea has been known in England at least since the 1820s. In 1837 there is a record of court proceedings against Brocksop & Co. who were found to have supplied tea "artificially scented, and, drugged with bergamot in this country", but there is no known published reference to an 'Earl Grey' tea before advertisements by Charlton & Co. of Jermyn Street in London in the 1880s, though 'Grey's Tea' is known from the 1850s
The Earl Grey blend, or "Earl Grey's Mixture", is assumed to be named after The 2nd Earl Grey, British Prime Minister in the 1830s and author of the Reform Bill of 1832. Lord Grey reputedly received a gift, probably a diplomatic perquisite, of tea flavoured with bergamot oil. Bergamot orange (Citrus bergamia) is a small citrus tree which blossoms during the winter and is grown commercially in Calabria, Italy. It is likely a hybrid of Citrus limetta and Citrus aurantium.
According to one legend, a grateful Chinese mandarin whose son was rescued from drowning by one of Lord Grey's men first presented the blend to the Earl in 1803. The tale appears to be apocryphal, as Lord Grey never set foot in China and the use of bergamot oil to scent tea was then unknown in China. However, this tale is subsequently told (and slightly corrected) as on the Twinings website, as "having been presented by an envoy on his return from China".
Jacksons of Piccadilly claim they originated Earl Grey's Tea, Lord Grey having given the recipe to Robert Jackson & Co. partner George Charlton in 1830. According to Jacksons, the original recipe has been in constant production and has never left their hands. Theirs has been based on China tea since the beginning.
According to the Grey family, the tea was specially blended by a Chinese mandarin for Lord Grey, to suit the water at Howick Hall, the family seat in Northumberland, using bergamot in particular to offset the preponderance of lime in the local water. Lady Grey used it to entertain in London as a political hostess, and it proved so popular that she was asked if it could be sold to others, which is how Twinings came to market it as a brand.
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Source: Wikipedia