Who is the patron saint of Ireland?

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, along with saints Brigit of Kildare and Columba. He is venerated in the Roman Catholic Church, the Lutheran Churches, Anglican Communion, the Old Catholic Church and in the Eastern Orthodox Church as equal-to-the-apostles and Enlightener of Ireland.

The dates of Patrick's life cannot be fixed with certainty, but there is broad agreement that he was active as a missionary in Ireland during the second half of the 5th century. Early medieval tradition credits him with being the first bishop of Armagh and Primate of Ireland, and they regard him as the founder of Christianity in Ireland, converting a society practising a form of Celtic polytheism. He has been generally so regarded ever since, despite evidence of some earlier Christian presence in Ireland.