Wallpaper for the 'Saint Patricks Day' feast, related to the commemoration of Saint Patrick and the arrival of Christianity in Ireland, cultural and religious holiday, celebrated on 17th of March in the Republic of Ireland, Northern Ireland, Newfoundland and Labrador, and in Montserrat. The shamrock with three leaves is the national flower and symbol of Ireland, which symbolizes the Trinity of the Father, Son and Holy Spirit, faith, hope and charity, or past, present and future.