Who is Saint Valentine? How did Valentine's Day come to be? Well, there's more than one theory! This fill-in-the-blank story is a fun way to take a trip back in time to learn about Saint Valentine. Kids will learn a few different stories that explain how February 14 became a day to celebrate love. Learn about the legendary figure with this fill-in-the-blank worksheet and answer the question, "Who is Saint Valentine?" for yourself.