It's not all about St. Valentine! Cupid—that winged baby boy often seen on Valentine's Day cards and paraphernalia—is another symbol of this love-filled holiday, and it's easy to understand why. In Roman mythology, Cupid was the son of Venus, goddess of love and beauty. He was known for shooting arrows at both gods and humans, causing them to fall instantly in love with one another. While it's unclear exactly when Cupid was brought into the Valentine's Day story, it's certainly clear why.