If it’s March, and it’s green, it must be St. Patrick’s Day. The day honoring the patron saint of Ireland is a global ...

St. Patrick’s Day usually conjures images of partying, Catholicism, Irish nationalism and, perhaps most famously, the color green: green clothes, green shamrocks, green beer and green rivers.

However, blue still plays a symbolic role in Ireland: Since 1945, the flag representing the president of Ireland has a gold harp with a dark blue background – the color known as St. Patrick’s ...