St. Patrick's Day, also known as the Feast of St. Patrick, is a cultural and religious holiday that is celebrated annually on March 17th. The holiday honors Saint Patrick, the patron saint of Ireland, and commemorates the arrival of Christianity in Ireland. St. Patrick was a missionary who lived in the 5th century and is credited with bringing Christianity to Ireland. The holiday is celebrated in many parts of the world, but is particularly popular in Ireland and among Irish immigrants a...