According to the Confessio of Patrick, when he was about 16 he was captured by Irish pirates from his home in Great Britain, and taken as a slave to Ireland, looking after animals, where he lived for six years before escaping and returning to his family. After becoming a cleric, he returned to northern and western Ireland. In later life, he served as an ordained bishop, but little is known about the places where he worked. By the seventh century, he had already come to be revered as the patron saint of Ireland.

Saint Patrick's Day is observed on 17 March, which is said to be the date of his death. It is celebrated inside and outside Ireland as a religious and cultural holiday. In the dioceses of Ireland, it is both a solemnity and a holy day of obligation; it is also a celebration of Ireland itself.