Saint Patrick's Cathedral, founded in 1191, is the National Cathedral of the Church of Ireland.
Known as the "Apostle of Ireland", Saint Patrick is the primary patron saint of Ireland. He was never formally canonised.
Legend credits Patrick with teaching the Irish about the doctrine of the Holy Trinity by showing people the shamrock, a three-leafed plant, using it to illustrate the Christian teaching of three persons in one God.
Although all the evidence suggests that post-glacial Ireland never had snakes, there is a legend about Patrick who banishes all the snakes from Ireland.