by 
St. Patrick’s Day is celebrated annually on March 17, the anniversary of his death in the fifth century. The Irish have observed this day as a religious holiday for over 1,000 years. On St. Patrick’s Day, which falls during the Christian season of Lent, Irish families would traditionally attend church in the morning and celebrate in the afternoon.
The most widely-seen St Patrick’s Day symbols are the colors green, and sometimes orange, and the shamrock. The shamrock is a symbol of Ireland and a registered trademark of the Republic of Ireland. It is the leaf of the clover plant, which grows on the ground, often among grass and an Irish Catholic symbol of the Holy Trinity. It is sometimes confused with the four-leaf clover, which is a variety of the three-leaf clover and is thought to bring good luck.
