Saint Patrick's Day (Irish: Lá Fhéile Pádraig) is a yearly holiday celebrated on 17 March. It is named after Saint Patrick (circa AD 387–461), the most commonly recognized of the patron saints of Ireland. It began as a purely Catholic holiday and became an official feast day in the early 1600s. However, it has gradually become more of a secular celebration of Ireland's culture.
It is a public holiday on the island of Ireland (both Northern Ireland and the Republic of Ireland) and widely celebrated by the Irish diaspora in places such as Great Britain, Canada, the United States, Argentina, Australia, New Zealand, and Montserrat.