Missionaries from the West: The Irish Church and Celtic Christianity unveils the extraordinary story of how a small island on the edge of Europe became the spiritual powerhouse that reshaped the Christian world. From the life and mission of St. Patrick—the enigmatic figure who brought Christianity to Ireland—to the visionary monk Columba and the founding of the iconic monasteries of Iona and Lindisfarne, this book traces the rise of Celtic Christianity and its enduring influence on medieval Europe. Combining rigorous historical analysis with vivid storytelling, this work explores the distinctive features that set the Irish Church apart: its pioneering monasticism, vibrant artistic and literary traditions, profound spirituality, and unique approach to missionary exile, or peregrinatio pro Christo. Readers will journey through dramatic events such as the Synod of Whitby, which forged religious unity amid competing traditions, and witness how Irish missionaries carried their faith across oceans, leaving an indelible mark on Scotland, England, and the Continent. Richly contextualized with primary source insights and the latest scholarship, Missionaries from the West offers an accessible yet authoritative portrait of a faith tradition that blended indigenous culture and Christian doctrine in groundbreaking ways. It reveals how the Irish Church's memory and myths continue to inspire, from medieval high crosses and illuminated manuscripts to contemporary spiritual revivals. This is the definitive account for anyone fascinated by the intersections of religion, culture, and history—the untold story of the Celtic Church's transformative power and its legacy that still resonates today.