Saint Patrick is associated with the conversion of Ireland and traditionally introduced Christianity there in the fifth century.
Patrick was born in Roman Britain, probably in the late fourth or early fifth century. As a teenager, he was taken captive by Irish raiders and forced to work as a shepherd in Ireland. He later escaped, returned to Britain, and eventually became a Christian missionary.
In his Confessio, Patrick describes returning to Ireland after receiving a vision that called him to serve the Irish people. He preached Christianity, baptized converts, and established churches, although the exact scale of his work is difficult to reconstruct from surviving evidence.
Later legends associate Patrick with driving snakes from Ireland and explaining the Trinity with a shamrock. These stories are part of popular tradition rather than details established by his own writings. Saint Patrick’s Day is celebrated on 17 March, the traditional date of his death.