St Patrick's Day is celebrated on March 17th to honor St Patrick, a missionary who brought Christianity to Ireland. While a religious holiday in Ireland, St Patrick's Day is celebrated in Canada and other countries by people of many backgrounds as a time to recognize Irish heritage and culture. Traditions include wearing green clothes, saying "Happy Saint Patrick's Day," and recognizing symbols of Ireland like shamrocks, leprechauns, and pots of gold at the end of rainbows.