Learn more about the history of St. Patrick’s Day! St. Patrick’s Day celebrates the patron saint of Ireland, and is usually celebrated on March 17th. St. Patrick’s Day is a national holiday in Ireland. It is also celebrated in Montserrat, Canada, the UK, Australia, Argentina, New Zealand, and here in the United States, thought it is not an official holiday for these countries.
The history of St. Patrick's Day begins with Patrick's birth in Roman Britain. St Patrick was a Christian missionary to Ireland in the 4th century. Legend holds that he used the 3-leaf clover to explain the Holy Trinity to the Irish, which is why the clover and the wearing of green are part of modern day celebrations.