This document discusses the history and traditions of St. Patrick's Day. It explains that St. Patrick's Day is celebrated on March 17th and is both a holy and national holiday in Ireland. It describes how St. Patrick brought Christianity to Ireland and used the shamrock to help convert people. The document also discusses Irish legends about St. Patrick banishing snakes from Ireland and leprechauns guarding pots of gold at the ends of rainbows. Finally, it outlines common ways the Irish celebrate, such as wearing green, attending parades, and drinking green beer.