This book explores the complex and transformative process of the Christianization of the Germanic peoples during the early Middle Ages, spanning from the 5th to the 10th centuries. Through a detailed historical analysis, it examines how the Germanic tribes—initially resistant to the Christian faith—gradually embraced Christianity and integrated it into their political, social, and cultural structures. The book explores key moments in this process, such as the conversion of Clovis I, the role of Charlemagne, and the missionary efforts of figures like St. Boniface and St. Augustine of Canterbury. In addition to religious conversion, the book delves into the profound impact of Christianity on governance, law, art, and social institutions. It traces how Christian kingship emerged as a unifying force, reshaping the political landscape of Europe, while Christian moral and ethical teachings began to influence the legal systems of the Germanic kingdoms. Monasteries played a central role in both the spread of Christianity and the preservation of classical knowledge, acting as centers of education, charity, and artistic production. The book also explores the syncretism that characterized the Christianization process, where pagan traditions were integrated with Christian practices, making the transition less disruptive and more culturally coherent for the Germanic peoples. Through a thorough analysis of primary sources, such as the Royal Frankish Annals, Vita Sancti Galli, and the Visigothic Code, the book provides a nuanced understanding of how Christianity reshaped the Germanic world. The book concludes by reflecting on the lasting legacy of the Christianization of the Germanic peoples, particularly in the formation of medieval Christian Europe and the development of Western civilization.