Religion in the Republic of Ireland
The predominant religion in the Republic of Ireland is Christianity, with the largest church being the Roman Catholic Church. The Irish constitution says that the state may not endorse any particular religion and guarantees freedom of religion.
Saint Patrick
Saint Patrick (; ; ) was a fifth-century Romano-British Christian missionary and bishop in Ireland. Known as the "Apostle of Ireland", he is the primary patron saint of Ireland, the other patron saints being Brigit of Kildare and Columba. He is venerated in the Roman Catholic Church, the Anglican Communion, the Lutheran Churches, the Old Catholic Church, and in the Eastern Orthodox Church as equal-to-the-apostles and "Enlightener of Ireland".