Patrick was a 5th century Romano-British Christian missionary and bishop in Ireland. A lot of what is known about him comes from the “Declaration”. He came from a wealthy family; his father a deacon and grandfather a priest. The Declaration says that at 16 he was kidnapped by Irish raiders and taken as a slave to Gaelic Ireland. He spent 6 years working as a shepherd and found God. Apparently God told him to flee to the coast where a waiting ship took him home and he became a priest. He then returned to Ireland to convert the pagan Irish to Christianity.
Saint Patrick’s Day, or the Feast of Saint Patrick, is held on March 17. It is the date of death of Saint Patrick the patron saint of Ireland. For the day the Catholic Lenten restrictions on eating and drinking alcohol are lifted. It is customary to wear a shamrock or green clothing on the day. It is claimed that Saint Patrick wore a shamrock in order to explain the Trinity. In 1783 the color blue was adopted by the Order of St. Patrick. In the 1790’s green became associated with Irish nationalism. The color green and its association with St. Patrick has grown since the 19th century.
Here is a video of River Dance: (https://www.youtube.com/watch?v=HgGAzBDE454)