Valentine's Day aka Saint Valentine's Day aka Feast of Saint Valentine is an annual February 14th observance which originated as a Christian feast day honoring a beatified martyr named Valentine.
Later it has evolved through a number of secular iterations and folk traditions whereby it has also become a significant cultural, religious and commercial celebration of romance and love internationially.
When I was working I always marked the day with large 2 pound Whitman Samplers in the break room and greeted all
my female cohorts with respect and admiration which, as it turns out — was totally for naught.