According to the Confession of St. Patrick, at the age of just sixteen Patrick was captured by a group of Irish pirates. The raiders brought Patrick to Ireland where he was enslaved and held captive for six years. Patrick writes in The Confession that the time he spent in captivity was critical to his spiritual development. He explains that the Lord had mercy on his youth and ignorance, and afforded him the opportunity to be forgiven of his sins and converted to Christianity. While in captivity, Saint Patrick worked as a shepherd and strengthened his relationship with God through prayer eventually leading him to convert to Christianity.
After six years of captivity heard a voice telling him that he would soon go home, and then that his ship was ready. Fleeing his master, he travelled to a port, two hundred miles away where he found a ship and with difficulty persuaded the captain to take him. After three days sailing they landed, presumably in Britain, and apparently all left the ship, walking for 28 days in a “wilderness”, becoming faint from hunger before encountering a herd of wild boar; since this was shortly after Patrick had urged them to put their faith in God, his prestige in the group was greatly increased. After various adventures, he returned home to his family, now in his early twenties After returning home to Britain, Saint Patrick continued to study Christianity.
Patrick recounts that he had a vision a few years after returning home:
I saw a man coming, as it were from Ireland. His name was Victoricus, and he carried many letters, and he gave me one of them. I read the heading: “The Voice of the Irish”. As I began the letter, I imagined in that moment that I heard the voice of those very people who were near the wood of Foclut, which is beside the western sea—and they cried out, as with one voice: “We appeal to you, holy servant boy, to come and walk among us.”
Acting on the vision, Patrick returned to Ireland as a Christian missionary.