He was born in 389 A.D., during the time of the Roman Empire's decay: immigrants flooded the borders; the national language of Latin was displaced; the underfunded military stretched across the world; rampant sexual immorality existed; and city centers were abandoned. Additionally, unbearable taxes, a burgeoning national debt and welfare rolls, and an excessive amount of government jobs plagued the Empire.

Patrick's  home was the coastal town of Bonavern, Taberniae, Britain. His father, Calpurnius, was a civil magistrate and a deacon, and his grandfather was a minister in the Celtic Christian Church, whose origins date from second-century Roman occupation.

At age 16, Patrick was kidnapped by raiders and sold as a slave in Ireland. For six years he herded pigs on a Slemish farm. Repulsed by the Druid's human sacrifice, magic spells, and superstitions, from which Halloween originated, Patrick committed himself to Christ, as he later wrote: "The Lord opened the understanding of my unbelief, that, late as it was, I might remember my faults and turn to the Lord my God with all my heart; and He had regard to my low estate, and pitied my youth and ignorance, and kept guard over me even before I knew Him."

Patrick's life became marked by intense prayer. He described an "inner monition" which he recognized as the Holy Spirit. He was led to escape to the seacoast, where he found a ship to freedom. As they left Ireland, a storm blew them to Gaul (France), where he lived in a monastery on the island of St. Honorat for several months.

Years later, Patrick had a dream, as he wrote in his Confessions: "In the depth of the night, I saw a man named Victoricus coming as if from Ireland, with innumerable letters; and he gave me one of these, and ... [that] moment I heard the voice of those who were beside the wood of Focluth, near the western sea; and this is what they called out: 'Please, holy boy, come and walk among us again.' Their cry pierced to my very heart, and I could read no more; and so I awoke."

Patrick left his family and prepared for the ministry in Auzerre, Gaul. At age 40 he was permitted to go. In the year 432, the same time Attila the Hun was pillaging Europe, Patrick crossed the icy sea to Ireland with twelve brave monks.

They made their way to the home of his old master, but found he died in a battle with a neighboring tribe. Undoubtedly, had Patrick not escaped, he would have been killed as well. They then went to the hall of Chieftain Loigaire, who was feasting with his warriors and Druid priests.

A messenger ran in, interrupting the festivities, and announced the arrival of these unarmed strangers. As they entered the long, smoky hall, carrying a tall cross, silence fell. The Druid priests were threatened and alarmed when Patrick boldly spoke in their own language, which he had learned while a slave. The chieftain was astonished, and not only granted them religious toleration, but was baptized and donated the land for their first wooden church.

Druid opposition grew fierce, and twelve times Patrick faced life-threatening situations, including a harrowing kidnapping and a two-week captivity. Patrick demonstrated that God's power is greater than Druid magic, resulting in many chieftains being converted. Feeling inadequate due to his lack of education, Patrick used illustrations to preach, the most famous of which was the three-leaf clover, which he used to explain the Trinity.