A few quick internet searches on “The History of St. Patrick’s Day” will yield you some the following information.
Saint Patrick was the apostle of Ireland. St Patrick is credited with bringing Christianity to Ireland. Most of what is known about him comes from his two works; the Confessio, a spiritual autobiography, and his Epistola, a denunciation of British mistreatment of Irish Christians. Saint Patrick described himself as a “most humble-minded man, pouring forth a continuous paean of thanks to his Maker for having chosen him as the instrument whereby multitudes who had worshiped idols and unclean things had become the people of God.”
Many folk ask the question ‘Why is the Shamrock the National Flower of Ireland ?’ The reason is that St. Patrick used it to explain the Holy Trinity to the pagans.
Saint Patrick is most known for driving the snakes from Ireland, as in many old pagan religions, serpent symbols were common and often worshiped. Driving the snakes from Ireland was probably symbolic of putting an end to that pagan practice. While not the first to bring Christianity to Ireland, it is Patrick who is said to have encountered the Druids at Tara and abolished their pagan rites. The story holds that he converted the warrior chiefs and princes, baptizing them and thousands of their subjects in the “Holy Wells” that still bear this name.
Click the link to read About Saint Patrick – St Patrick’s Day 2014.