The significance of blue dates back to early Irish mythology when the sovereignty ... was granted its own coat of arms – a golden harp placed on a blue background. When George III created ...

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.

which is partly why a blue flag with a harp is associated with the Irish President. HISTORY.com says green is not a color that has much of an actual connection to St. Patrick but rather originated ...