Here's a look at what you need to know about St. Patrick's Day, celebrated March 17th of every year.
Facts: St. Patrick's Day is the feast day of St. Patrick, the patron saint of Ireland.
Saint Patrick: St. Patrick is called a Christian missionary and the Apostle of Ireland.
Patron saints are chosen to protect the interests of a country, place, group, trade or profession, or activity, and to intercede for them in heaven.
St. Patrick is responsible for converting the people of Ireland to Christianity.
385 A.D - Born in Britain, but is not Irish.
At sixteen, he was brought to Ireland as a slave.
He escaped six years later and becomes a priest.
Following a vision, he returned to Ireland to Christianize the Irish people.
He is credited with having driven the snakes out of Ireland. However, most biologists maintain there never were snakes in Ireland.
March 17, 461 A.D - St. Patrick dies.
Ireland: In Ireland, St. Patrick's Day is a national holiday with banks, stores, and businesses closing for the day.
It has primarily been celebrated as a religious holiday.
USA: 1737 - The first St. Patrick's Day celebration in the United States is held in Boston.
34.5 million U.S. residents claimed Irish ancestry in 2011. This number is more than seven times the population of Ireland itself (4.68 million). US Census
In the United States, St. Patrick's Day is primarily a secular holiday.
Many people wear green clothing, have parties and march in parades.
New York City Celebration: March 17, 1762 - The first official parade in New York City is held.
February 2011 - The book "Celebrating 250 Years of the New York City St. Patrick's Day Parade" is released.
March 17, 2011 - The 250th New York City St. Patrick's Day Parade is held.
The parade is held on March 17, unless March 17 falls on a Sunday. When this happens, the parade is held on Saturday the 16th.
The parade marches up 5th Avenue, from 44th to 86th streets. It is the world's largest St. Patrick's Day parade with more than 150,000 people marching each year.
Chicago Celebration: March 12, 1955 - The first St. Patrick's Day parade is held.
If the 17th falls on a weekday the parade is held the Saturday before.
The Chicago River is dyed green, with a secret recipe, each year between 10am and 11am and the parade begins at noon at the corner of Balbo and Columbus Drive