St. Valentine's Day has its origins in the martyrdom of St. Valentine on February 14th, after which Pope Gelasius named February 14th as St. Valentine's Day. The modern traditions of exchanging Valentine's cards and gifts with loved ones developed to commemorate St. Valentine and show affection for others on this day, with common symbols of love like Cupid, hearts, roses, and love birds featured prominently in Valentine's Day celebrations and traditions.