Valentine's Day is a holiday where people express their affection with greetings and gifts. It is celebrated on February 14th. Valentine's Day has its roots in both ancient Roman traditions and Christian martyrdom stories. The holiday has roots in the Roman festival of Lupercalia, which celebrated the coming of spring and included fertility rites. The holiday is also named after St. Valentine, a Christian martyr who lived in the 3rd century. According to legend, St. Valentine was a priest who defied Emperor Claudius II's decree that young men should not marry, as single men made better soldiers. Valentine continued to perform secret marriages for young lovers, and when his actions were discovered, he was imprisoned and eventually executed. Over time, the holiday evolved into a day of romance, especially from the 14th century onwards. Traditionally, people exchange valentines (greeting cards), chocolates, flowers, and other tokens of affection. The day is popular in many countries, including the United States, Canada, and the United Kingdom.