The following is an exerpt from the Encyclopaedia Britannica:
Valentine's Day, also called St. Valentine's Day, holiday (February 14) when lovers express their affection with greetings and gifts. The holiday has origins in the Roman festival of Lupercalia, held in mid-February. The festival, which celebrated the coming of spring, included fertility rites and the pairing off of women with men by lottery. At the end of the 5th century, Pope Gelasius I replaced Lupercalia with St. Valentine's Day. It came to be celebrated as a day of romance from about the 14th century.
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