Valentine's Day may originate from the Roman festival Lupercalia, celebrating fertility.
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The Catholic Church associated the day with St. Valentine, but multiple martyrs shared the name.
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The poet linked Valentine's Day to romantic love in the 14th century.
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In the 15th century, the Duke of Orleans sent the oldest known Valentine's Day card from the Tower of London.
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By the 18th century, exchanging cards and gifts became popular, leading to commercialization.
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Elaborate cards and love notes flourished, setting the tone for modern expressions of love.
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The heart shape became synonymous with love in the 19th century, further popularized by Valentine's Day.
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Today, Valentine's Day is a worldwide celebration of love, marked by diverse customs and expressions.
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