Valentine's Day is celebrated on February 14th to honor St. Valentine and express love and affection between couples. Since the 19th century, people have exchanged cards, flowers like roses, and chocolates on this day. Red roses symbolize love, white represents peace, and yellow symbolizes friendship. While Valentine's Day has become more commercialized, it originated from the Catholic tradition of honoring Saint Valentine, who was martyred in Rome in 269 AD. There are debates around whether the February 14th date was chosen to Christianize the ancient Roman fertility festival of Lupercalia.