Valentine's Day or Saint Valentine's Day is a holiday celebrated on February 14. In the West, it is the traditional day on which lovers express their love for each other by sending Valentine's cards, presenting flowers, or offering confectionery. The holiday is named after two among the numerous Early Christian martyrs named Valentine. The day became associated with romantic love in the circle of Geoffrey Chaucer in the High Middle Ages, when the tradition of courtly love flourished.
Don't forget to take a look on this site:
http://sites.google.com/site/seomaraingles/st--valentine-s-day