Tomorrow is St. Patrick’s Day so wear your favorite green shirt and search for some four-leaf clovers. But why is there a special day for the Emerald Isles and where did all these traditions come from?

Legend has it that St. Patrick was born in Britain in the fifth century. When he was 16 he was captured by Irish pirates and taken to Ireland. After six years he was able to escape and return home, but he heard voices asking him to return to Ireland. He did go back and dedicated his life to spreading Christianity.

Shamrocks are important to the St. Patrick’s Day story because supposedly St. Patrick used the three leaves of the shamrock to educate the Irish about the Christian Trinity. Finding a four leaf clover is considered good luck.

Can you believe the original color of St. Patty’s Day was blue? But because of the shamrock legend the color changed to green.

In Ireland St. Patrick’s Day is a national holiday. It is also considered a religious holiday there. It wasn’t until the 1990s that Ireland started using St. Patrick’s Day as a way to spread tourism.

In Argentina St. Patrick’s Day is celebrated in the streets with nightlong parties. It might come as a surprise but Argentina is home to the world’s fifth largest Irish community (outside Ireland).

Ireland is nicknamed the Emerald Isle because of its lush green hills.