How monasticism, mysticism, mendicants, and scholasticism changed Christianity. A look at the evolution of the Christian church throughout the Middle Ages, highlighting key figures, theological shifts, and institutional developments. The texts examine the expansion of the faith through the efforts of missionaries like Patrick and Cyril, while also detailing the rise of monasticism and various religious orders focused on poverty and service. A significant portion of the material is dedicated to scholasticism and mysticism, featuring the intellectual contributions of Thomas Aquinas and the spiritual visions of Hildegard of Bingen. Furthermore, the sources explore internal conflicts, such as the iconoclastic controversy, the Crusades, and the emergence of dissenting groups like the Waldensians. Through comprehensive historical charts and narratives, the collection illustrates the complex intersection of church authority, political power, and reform leading toward the Reformation.