What was Saint Patrick's tradition?

Answer 1

Saint Patrick day is on March 17, celebrated internationally. One traditional icon of the day is the shamrock. And this stems from a more bona fide Irish tale that tells how Patrick used the three-leafed shamrock to explain the Trinity. He used it in his sermons to represent how the Father, the Son, and the Holy Spirit could all exist as separate elements of the same entity. His followers adopted the custom of wearing a shamrock on his feast day.

Today St Patrick Day is celebrated with parades, wearing green outfits, and drinking beer.