The legend is that Valentine's day was named after Valentine, an early Christian Saint. It was said that Valentine  performed weddings for soldiers who were forbidden to marry.  Valentine's day became associated with romance in the Middle Ages.  In the 15th century, gifts of cards, candy and flowers became part of the expression of love on Valentine's Day.

for more on St.Valentine see Feb14th  on this page of "Historic Events" on All Things Clipart.