In modern times, the month of February and St. Velentine's Day has come to symbolize love and romance, and has been celebrated in this gentile way since the days of courtship and wooing of the Middle Ages. But the origins of February being associated with love and fertility can be traced back to Ancient Greece and Rome.
On February 14, A.D. 496, the feast of St. Valentine was first declared, and the Lupercalia was outlawed as a pagan ritual.
Sources consulted:
Graves, R. The Larousse Encyclopedia of Mythology. New York: Barnes & Noble Books, 1994.
http://ancienthistory.about.com/
www.wikipedia.com