As the Roman Empire began to crumble, Celtic Christians began to embark more often on pilgrimages and quests. They found visionary islands on Skellig Michael, Iona, and Lindisfarne, yet their spirituality was largely concerned with politics and people. Brigid ruled a monastery for women and men, princesses and slaves, while Arthur was defending Celtic Britain against English invaders, and Aidan died protesting against his king. While some Celtic Christians did slam the monastery gates on the sinful world, most tramped into the hills to stand alongside ordinary people. Drawing on historical documents and a thoughtful examination of legends, this is an insightful resource that unveils the development of and tenets behind the various strands of Celtic Christianity.