From Judy - Happy St. Patrick’s Day

                                           

When he was about 16, he was captured from Wales by Irish raiders and taken as a slave to Ireland, where he lived for six years before escaping and returning to his family. After entering the Church, he returned to Ireland as an ordained bishop in the north and west of the island, but little is known about the places where he worked. By the seventh century, he had come to be revered as the patron saint of Ireland.

Most available details of his life are from later hagiographies from the seventh century onwards, and these are now not accepted without detailed criticism. Uncritical acceptance of the Annals of Ulster would imply that he lived from 340 to 440, and ministered in what is modern-day Northern Ireland from 428 AD onwards. The dates of Patrick's life cannot be fixed with certainty but, on a widespread interpretation, he was active as a missionary in Ireland during the second half of the 5th century.  --  from Wikipedia