Saint Patrick's Day, celebrated on March 17th, in the dioceses of Ireland it is a solemn and holy day of obligation and is officially called Saint Patrick's Feast Day. The original color associated with Saint Patrick was blue, but over time the color association changed to green and green ribbons and shamrocks were worn in celebration of the day was early as the 17th century. The phrase “the wearing of the green”, which means wearing a green shamrock on clothing comes from a song of the same name.
Saint Patrick is a national day in Ireland, but Irish in Europe have been celebrating it since the 9th century; and later became known as the patron of Ireland. The Feast Day was officially listed in the liturgical calender in the Catholic Church, influenced by Luke Wadding, a Franciscan scholar in the early 17th century. A solemn ceremony in the Roman Catholic Church, it is a great feast day in the Church of Ireland.