During the 5th century, Saint Patrick arrived in Ireland and changed the course of the nation's history. Burt Wolf investigates the real story of Patrick's life, visits Patrick's original church, treks to the mystic pilgrimage sites of Lough Derg and Croagh Patrick and explores the reasons why St. Patrick became the patron saint of the Irish. He also examines the diaries of the ancient monks who chronicled the attacks of the Vikings.