Saint Patrick is the patron saint of Ireland and is credited with bringing Christianity to the island. Although born in Roman Britain, he was kidnapped and taken to Ireland as a slave. After escaping, he became a cleric and returned to Ireland as a missionary. Patrick is often credited with using the shamrock to explain the concept of the Holy Trinity. He is also associated with driving the snakes out of Ireland, a metaphor for his efforts to Christianize the pagan Irish. Saint Patrick's Day is celebrated on March 17, the traditional date of his death, with parades, feasting, and cultural events around the world.