This volume, condensed from Dr. Justo González’s popular three-volume history, is revised and updated. While retaining the essential elements of the earlier three volumes, this book describes the central figures and debates leading to the Councils of Nicea and Chalcedon. Then it moves to Augustine and shows how Christianity evolved and was understood in the Latin West and Byzantine East during the Middle Ages. Finally, the book introduces the towering theological leaders of the Reformation and continues to trance the development of Protestant, Catholic, and Orthodox Christianities through modernity in the twentieth century to post-modernity in the twenty-first.