St. Patrick, the patron saint of Ireland, is a widely known historic figure and arguably the most famous patron saint of a country. St. Patrick's Day is celebrated on his birthday, which is accepted to be 17 March.
The largest St. Patrick's Day Parade is not held in Ireland. That honor belongs to New York City, where the annual St. Patrick's Day Parade draws more than a million spectators each year.
Although many people wear some form of green in honor of St. Patrick's Day, green was once considered an unlucky color in Ireland.
St. Patrick's Day is a national holiday in the Caribbean nation of Montserrat.
The city of Montreal, Canada, uses a shamrock in its city flag.
There are roughly 33 million U.S. residents of Irish ancestry. That number is nearly 9 times the population of Ireland.
Blue was the original color associated with St. Patrick.
In Ireland, St. Patrick's Day has traditionally been a religious occasion. Until the 1970s, many stores and pubs were closed. Laws were changed in 1995.
The first recorded St. Patrick's Day parade didn't actually take place in Ireland, when on 17 March 1762, Irish soldiers serving in the English military marched through New York City.
St. Patrick is not the only patron saint of Ireland, both 'Brigid of Kildare' and 'Columba' are officially recognised as such.
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