Driving the Snakes from Ireland
Probably one of the best known legends surrounding Saint Patrick is that of driving snakes from Ireland. Though it‘s unlikely there were any snakes in Ireland to start with, due mainly to the island of Ireland being separated from the rest of the continent at the end of the Ice Age.
It’s much more likely that the snakes were a symbol for something else. Old pagan religions featured and worshiped serpent symbols. Saint Patrick was responsible for converting many pagans to Christianity.
The legend of driving the snakes from Ireland is much more likely to refer to putting an end to paganism, than actual snakes.
Another Saint Patrick legend, tells of him using the shamrock in his teachings to highlight the holy trinity. The Christian belief of 3 divine persons in the one God.