While the origins of Valentine's Day date back as far as the 5th century, the tradition of sending cards only became popular in the last 300 years. Originally, the occasion was known as the Feast of Saint Valentine and was a day of feasting to honour Saint Valentine. Valentine's Day first became linked with romance in the 18th century, when couples would show their love with cards, flowers and gifts. This celebration of love has grown ever since, becoming the Valentine's Day we know today!