Who Was St. Patrick…And Why Do We Celebrate Him?

March 17 is a day full of green: green beer, green cabbage (and corned beef), green shamrocks and green clothing (sometimes worn by leprechauns). For many people it’s a day to gather at local pubs and bars to celebrate Ireland’s patron saint. But why do we celebrate this man, on this day, with this color–and lots of beer? Who was St. Patrick?